28647680 has 36 divisors (see below), whose sum is σ = 68623212. Its totient is φ = 11458560.

The previous prime is 28647677. The next prime is 28647709. The reversal of 28647680 is 8674682.

It can be written as a sum of positive squares in 2 ways, for example, as 13778944 + 14868736 = 3712^2 + 3856^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9911 + ... + 12470.

Almost surely, 2^28647680 is an apocalyptic number.

28647680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28647680 is an abundant number, since it is smaller than the sum of its proper divisors (39975532).

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

28647680 is an equidigital number, since it uses as much as digits as its factorization.

28647680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22402 (or 22388 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 28647680 is about 5352.3527536963. The cubic root of 28647680 is about 305.9824274016.

The spelling of 28647680 in words is "twenty-eight million, six hundred forty-seven thousand, six hundred eighty".