28131976 has 32 divisors (see below), whose sum is σ = 55028160. Its totient is φ = 13470912.

The previous prime is 28131959. The next prime is 28131977. The reversal of 28131976 is 67913182.

It is not an unprimeable number, because it can be changed into a prime (28131977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17461 + ... + 19003.

It is an arithmetic number, because the mean of its divisors is an integer number (1719630).

Almost surely, 2^28131976 is an apocalyptic number.

It is an amenable number.

28131976 is a deficient number, since it is larger than the sum of its proper divisors (26896184).

28131976 is a wasteful number, since it uses less digits than its factorization.

28131976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645 (or 1641 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 28131976 is about 5303.9585217081. The cubic root of 28131976 is about 304.1352410727.

The spelling of 28131976 in words is "twenty-eight million, one hundred thirty-one thousand, nine hundred seventy-six".