28704660 has 24 divisors (see below), whose sum is σ = 80373216. Its totient is φ = 7654560.

The previous prime is 28704659. The next prime is 28704671. The reversal of 28704660 is 6640782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239146 + ... + 239265.

It is an arithmetic number, because the mean of its divisors is an integer number (3348884).

Almost surely, 2^28704660 is an apocalyptic number.

28704660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28704660 is an abundant number, since it is smaller than the sum of its proper divisors (51668556).

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

28704660 is a wasteful number, since it uses less digits than its factorization.

28704660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478423 (or 478421 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 28704660 is about 5357.6730023397. The cubic root of 28704660 is about 306.1851585616.

The spelling of 28704660 in words is "twenty-eight million, seven hundred four thousand, six hundred sixty".