28810988 has 18 divisors (see below), whose sum is σ = 53561676. Its totient is φ = 13557568.

The previous prime is 28810981. The next prime is 28810993. The reversal of 28810988 is 88901882.

It is a super-2 number, since 2×28810988² = 1660146059072288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28810981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11306 + ... + 13617.

Almost surely, 2^28810988 is an apocalyptic number.

It is an amenable number.

28810988 is a deficient number, since it is larger than the sum of its proper divisors (24750688).

28810988 is a wasteful number, since it uses less digits than its factorization.

28810988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24961 (or 24942 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 44.

The square root of 28810988 is about 5367.5867948269. The cubic root of 28810988 is about 306.5627504455.

The spelling of 28810988 in words is "twenty-eight million, eight hundred ten thousand, nine hundred eighty-eight".