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28321751047 = 37765452731
BaseRepresentation
bin11010011000000110…
…111010000000000111
32201002210101000121111
4122120012322000013
5431000332013142
621002201225451
72021560624522
oct323006720007
981083330544
1028321751047
1111013987827
1255a4a92287
132894792c95
1415295c5bb9
15b0b61ee17
hex6981ba007

28321751047 has 4 divisors (see below), whose sum is σ = 29087203816. Its totient is φ = 27556298280.

The previous prime is 28321750991. The next prime is 28321751053. The reversal of 28321751047 is 74015712382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-28321751047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321751057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382726329 + ... + 382726402.

It is an arithmetic number, because the mean of its divisors is an integer number (7271800954).

Almost surely, 228321751047 is an apocalyptic number.

28321751047 is a deficient number, since it is larger than the sum of its proper divisors (765452769).

28321751047 is an equidigital number, since it uses as much as digits as its factorization.

28321751047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765452768.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 28321751047 in words is "twenty-eight billion, three hundred twenty-one million, seven hundred fifty-one thousand, forty-seven".

Divisors: 1 37 765452731 28321751047