28001904 has 40 divisors (see below), whose sum is σ = 82673280. Its totient is φ = 8000448.

The previous prime is 28001899. The next prime is 28001921. The reversal of 28001904 is 40910082.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41334 + ... + 42005.

It is an arithmetic number, because the mean of its divisors is an integer number (2066832).

Almost surely, 2^28001904 is an apocalyptic number.

28001904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28001904 is an abundant number, since it is smaller than the sum of its proper divisors (54671376).

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

28001904 is a wasteful number, since it uses less digits than its factorization.

28001904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83357 (or 83351 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 28001904 is about 5291.6825301599. The cubic root of 28001904 is about 303.6657799666.

Adding to 28001904 its reverse (40910082), we get a palindrome (68911986).

The spelling of 28001904 in words is "twenty-eight million, one thousand, nine hundred four".