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28951021 = 113078573
BaseRepresentation
bin110111001110…
…0000111101101
32000110212100001
41232130013231
524402413041
62512304301
7501036211
oct156340755
960425301
1028951021
1115384370
129842091
135cc86a8
143bb8941
15281d131
hex1b9c1ed

28951021 has 8 divisors (see below), whose sum is σ = 31689504. Its totient is φ = 26230320.

The previous prime is 28951009. The next prime is 28951033. The reversal of 28951021 is 12015982.

It is an interprime number because it is at equal distance from previous prime (28951009) and next prime (28951033).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28951021 - 25 = 28950989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28951001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 910 + ... + 7663.

It is an arithmetic number, because the mean of its divisors is an integer number (3961188).

Almost surely, 228951021 is an apocalyptic number.

It is an amenable number.

28951021 is a deficient number, since it is larger than the sum of its proper divisors (2738483).

28951021 is a wasteful number, since it uses less digits than its factorization.

28951021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8891.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 28951021 is about 5380.6152993872. The cubic root of 28951021 is about 307.0586207277.

It can be divided in two parts, 2895 and 1021, that added together give a triangular number (3916 = T88).

The spelling of 28951021 in words is "twenty-eight million, nine hundred fifty-one thousand, twenty-one".

Divisors: 1 11 307 3377 8573 94303 2631911 28951021