31028868 has 36 divisors (see below), whose sum is σ = 84468748. Its totient is φ = 9547200.

The previous prime is 31028827. The next prime is 31028873. The reversal of 31028868 is 86882013.

31028868 is a `hidden beast` number, since 310 + 288 + 68 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3968064 + 27060804 = 1992^2 + 5202^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31028868² = 1925581298722848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 32683 + ... + 33618.

Almost surely, 2^31028868 is an apocalyptic number.

It is an amenable number.

31028868 is an abundant number, since it is smaller than the sum of its proper divisors (53439880).

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

31028868 is a wasteful number, since it uses less digits than its factorization.

31028868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66324 (or 66319 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 31028868 is about 5570.3561825075. The cubic root of 31028868 is about 314.2355461442.

The spelling of 31028868 in words is "thirty-one million, twenty-eight thousand, eight hundred sixty-eight".