28508031 has 48 divisors (see below), whose sum is σ = 46335744. Its totient is φ = 17449344.

The previous prime is 28508027. The next prime is 28508041. The reversal of 28508031 is 13080582.

It is a happy number.

It is not a de Polignac number, because 28508031 - 2² = 28508027 is a prime.

It is a super-2 number, since 2×28508031² = 1625415662993922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28507986 and 28508004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28508041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 276726 + ... + 276828.

It is an arithmetic number, because the mean of its divisors is an integer number (965328).

Almost surely, 2^28508031 is an apocalyptic number.

28508031 is a deficient number, since it is larger than the sum of its proper divisors (17827713).

28508031 is a wasteful number, since it uses less digits than its factorization.

28508031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28508031 is about 5339.2912450999. The cubic root of 28508031 is about 305.4844259237.

The spelling of 28508031 in words is "twenty-eight million, five hundred eight thousand, thirty-one".