28921264 has 20 divisors (see below), whose sum is σ = 57843520. Its totient is φ = 13993920.

The previous prime is 28921261. The next prime is 28921271. The reversal of 28921264 is 46212982.

28921264 is an admirable number.

It is a super-2 number, since 2×28921264² = 1672879022715392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28921261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28659 + ... + 29650.

It is an arithmetic number, because the mean of its divisors is an integer number (2892176).

Almost surely, 2^28921264 is an apocalyptic number.

It is an amenable number.

28921264 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28921264 is a wasteful number, since it uses less digits than its factorization.

28921264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58348 (or 58342 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 28921264 is about 5377.8493842799. The cubic root of 28921264 is about 306.9533823474.

The spelling of 28921264 in words is "twenty-eight million, nine hundred twenty-one thousand, two hundred sixty-four".