31490568 has 48 divisors (see below), whose sum is σ = 85662720. Its totient is φ = 10450656.

The previous prime is 31490567. The next prime is 31490573. The reversal of 31490568 is 86509413.

31490568 is a `hidden beast` number, since 3 + 1 + 4 + 90 + 568 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (31490567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18105 + ... + 19767.

It is an arithmetic number, because the mean of its divisors is an integer number (1784640).

Almost surely, 2^31490568 is an apocalyptic number.

It is an amenable number.

31490568 is an abundant number, since it is smaller than the sum of its proper divisors (54172152).

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

31490568 is a wasteful number, since it uses less digits than its factorization.

31490568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938 (or 1931 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 31490568 is about 5611.6457479068. The cubic root of 31490568 is about 315.7864550940.

The spelling of 31490568 in words is "thirty-one million, four hundred ninety thousand, five hundred sixty-eight".