28760640 has 56 divisors (see below), whose sum is σ = 91318080. Its totient is φ = 7669248.

The previous prime is 28760561. The next prime is 28760687. The reversal of 28760640 is 4606782.

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, 14020 + ... + 15939.

It is an arithmetic number, because the mean of its divisors is an integer number (1630680).

Almost surely, 2^28760640 is an apocalyptic number.

28760640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28760640 is an abundant number, since it is smaller than the sum of its proper divisors (62557440).

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

28760640 is a wasteful number, since it uses less digits than its factorization.

28760640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29979 (or 29969 counting only the distinct ones).

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

The square root of 28760640 is about 5362.8947407161. The cubic root of 28760640 is about 306.3840706883.

The spelling of 28760640 in words is "twenty-eight million, seven hundred sixty thousand, six hundred forty".