28631660 has 24 divisors (see below), whose sum is σ = 61263216. Its totient is φ = 11236160.

The previous prime is 28631623. The next prime is 28631663. The reversal of 28631660 is 6613682.

It is not an unprimeable number, because it can be changed into a prime (28631663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12446 + ... + 14565.

It is an arithmetic number, because the mean of its divisors is an integer number (2552634).

Almost surely, 2^28631660 is an apocalyptic number.

28631660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28631660 is an abundant number, since it is smaller than the sum of its proper divisors (32631556).

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

28631660 is a wasteful number, since it uses less digits than its factorization.

28631660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27073 (or 27071 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28631660 is about 5350.8560062853. The cubic root of 28631660 is about 305.9253808684.

The spelling of 28631660 in words is "twenty-eight million, six hundred thirty-one thousand, six hundred sixty".