28717904 has 20 divisors (see below), whose sum is σ = 57436800. Its totient is φ = 13895520.

The previous prime is 28717901. The next prime is 28717907. The reversal of 28717904 is 40971782.

It is an interprime number because it is at equal distance from previous prime (28717901) and next prime (28717907).

28717904 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28454 + ... + 29445.

It is an arithmetic number, because the mean of its divisors is an integer number (2871840).

Almost surely, 2^28717904 is an apocalyptic number.

It is an amenable number.

28717904 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.

28717904 is a wasteful number, since it uses less digits than its factorization.

28717904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57938 (or 57932 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 28717904 is about 5358.9088441585. The cubic root of 28717904 is about 306.2322414248.

The spelling of 28717904 in words is "twenty-eight million, seven hundred seventeen thousand, nine hundred four".