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28911000426 = 23711601104123
BaseRepresentation
bin11010111011001110…
…101101101101101010
32202121212010222210120
4122323032231231222
5433202204003201
621140451024110
72042304306660
oct327316555552
982555128716
1028911000426
1111296562590
12572a29b036
132959896459
141583970c30
15b43217536
hex6bb3adb6a

28911000426 has 64 divisors (see below), whose sum is σ = 72210410496. Its totient is φ = 7496784000.

The previous prime is 28911000407. The next prime is 28911000439. The reversal of 28911000426 is 62400011982.

It is a super-3 number, since 3×289110004263 (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225601 + ... + 329723.

It is an arithmetic number, because the mean of its divisors is an integer number (1128287664).

Almost surely, 228911000426 is an apocalyptic number.

28911000426 is the 138831-st pentagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28911000426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36105205248).

28911000426 is an abundant number, since it is smaller than the sum of its proper divisors (43299410070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28911000426 is a wasteful number, since it uses less digits than its factorization.

28911000426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104747.

The product of its (nonzero) digits is 6912, while the sum is 33.

The spelling of 28911000426 in words is "twenty-eight billion, nine hundred eleven million, four hundred twenty-six", and thus it is an aban number.

Divisors: 1 2 3 6 7 11 14 21 22 33 42 66 77 154 231 462 601 1202 1803 3606 4207 6611 8414 12621 13222 19833 25242 39666 46277 92554 104123 138831 208246 277662 312369 624738 728861 1145353 1457722 2186583 2290706 3436059 4373166 6872118 8017471 16034942 24052413 48104826 62577923 125155846 187733769 375467538 438045461 688357153 876090922 1314136383 1376714306 2065071459 2628272766 4130142918 4818500071 9637000142 14455500213 28911000426