28921368 has 48 divisors (see below), whose sum is σ = 84111480. Its totient is φ = 8262912.

The previous prime is 28921349. The next prime is 28921397. The reversal of 28921368 is 86312982.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11121 + ... + 13472.

Almost surely, 2^28921368 is an apocalyptic number.

28921368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28921368 is an abundant number, since it is smaller than the sum of its proper divisors (55190112).

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

28921368 is a wasteful number, since it uses less digits than its factorization.

28921368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24616 (or 24605 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 28921368 is about 5377.8590535640. The cubic root of 28921368 is about 306.9537502787.

The spelling of 28921368 in words is "twenty-eight million, nine hundred twenty-one thousand, three hundred sixty-eight".