28904580 has 48 divisors (see below), whose sum is σ = 89927040. Its totient is φ = 7707744.

The previous prime is 28904563. The next prime is 28904587. The reversal of 28904580 is 8540982.

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

It is not an unprimeable number, because it can be changed into a prime (28904587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26224 + ... + 27303.

It is an arithmetic number, because the mean of its divisors is an integer number (1873480).

Almost surely, 2^28904580 is an apocalyptic number.

28904580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28904580 is an abundant number, since it is smaller than the sum of its proper divisors (61022460).

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

28904580 is a wasteful number, since it uses less digits than its factorization.

28904580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53545 (or 53537 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28904580 is about 5376.2979828131. The cubic root of 28904580 is about 306.8943462541.

The spelling of 28904580 in words is "twenty-eight million, nine hundred four thousand, five hundred eighty".