28904904 has 96 divisors (see below), whose sum is σ = 93434400. Its totient is φ = 8255520.

The previous prime is 28904893. The next prime is 28904917. The reversal of 28904904 is 40940982.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9219 + ... + 11949.

It is an arithmetic number, because the mean of its divisors is an integer number (973275).

Almost surely, 2^28904904 is an apocalyptic number.

28904904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28904904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46717200).

28904904 is an abundant number, since it is smaller than the sum of its proper divisors (64529496).

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

28904904 is a wasteful number, since it uses less digits than its factorization.

28904904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760 (or 2743 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28904904 is about 5376.3281149870. The cubic root of 28904904 is about 306.8954929397.

The spelling of 28904904 in words is "twenty-eight million, nine hundred four thousand, nine hundred four".