28347680 has 24 divisors (see below), whose sum is σ = 66971772. Its totient is φ = 11339008.

The previous prime is 28347667. The next prime is 28347719. The reversal of 28347680 is 8674382.

It can be written as a sum of positive squares in 2 ways, for example, as 28344976 + 2704 = 5324^2 + 52^2 .

It is a super-2 number, since 2×28347680² = 1607181922764800, which contains 22 as substring.

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, 88427 + ... + 88746.

Almost surely, 2^28347680 is an apocalyptic number.

28347680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28347680 is an abundant number, since it is smaller than the sum of its proper divisors (38624092).

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

28347680 is a wasteful number, since it uses less digits than its factorization.

28347680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177188 (or 177180 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 28347680 is about 5324.2539383467. The cubic root of 28347680 is about 304.9105892177.

The spelling of 28347680 in words is "twenty-eight million, three hundred forty-seven thousand, six hundred eighty".