28904408 has 24 divisors (see below), whose sum is σ = 58688100. Its totient is φ = 13339872.

The previous prime is 28904371. The next prime is 28904411. The reversal of 28904408 is 80440982.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 9338 + ... + 12041.

Almost surely, 2^28904408 is an apocalyptic number.

It is an amenable number.

28904408 is an abundant number, since it is smaller than the sum of its proper divisors (29783692).

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

28904408 is a wasteful number, since it uses less digits than its factorization.

28904408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21411 (or 21394 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 28904408 is about 5376.2819866521. The cubic root of 28904408 is about 306.8937375163.

The spelling of 28904408 in words is "twenty-eight million, nine hundred four thousand, four hundred eight".