28745904 has 40 divisors (see below), whose sum is σ = 81012672. Its totient is φ = 8710720.

The previous prime is 28745903. The next prime is 28745911. The reversal of 28745904 is 40954782.

It is not an unprimeable number, because it can be changed into a prime (28745903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26694 + ... + 27749.

Almost surely, 2^28745904 is an apocalyptic number.

28745904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28745904 is an abundant number, since it is smaller than the sum of its proper divisors (52266768).

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

28745904 is a wasteful number, since it uses less digits than its factorization.

28745904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54465 (or 54459 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 28745904 is about 5361.5206798072. The cubic root of 28745904 is about 306.3317347298.

It can be divided in two parts, 2874 and 5904, that added together give a palindrome (8778).

The spelling of 28745904 in words is "twenty-eight million, seven hundred forty-five thousand, nine hundred four".