28371520 has 28 divisors (see below), whose sum is σ = 67560444. Its totient is φ = 11348480.

The previous prime is 28371493. The next prime is 28371533. The reversal of 28371520 is 2517382.

It can be written as a sum of positive squares in 2 ways, for example, as 3211264 + 25160256 = 1792^2 + 5016^2 .

It is a super-2 number, since 2×28371520² = 1609886294220800, 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, 44011 + ... + 44650.

It is an arithmetic number, because the mean of its divisors is an integer number (2412873).

Almost surely, 2^28371520 is an apocalyptic number.

28371520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28371520 is an abundant number, since it is smaller than the sum of its proper divisors (39188924).

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

28371520 is an equidigital number, since it uses as much as digits as its factorization.

28371520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88678 (or 88668 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 28371520 is about 5326.4922791646. The cubic root of 28371520 is about 304.9960404395.

The spelling of 28371520 in words is "twenty-eight million, three hundred seventy-one thousand, five hundred twenty".