31490880 has 56 divisors (see below), whose sum is σ = 99986592. Its totient is φ = 8397312.

The previous prime is 31490857. The next prime is 31490917. The reversal of 31490880 is 8809413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15442 + ... + 17361.

Almost surely, 2^31490880 is an apocalyptic number.

31490880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31490880 is an abundant number, since it is smaller than the sum of its proper divisors (68495712).

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

31490880 is a wasteful number, since it uses less digits than its factorization.

31490880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32823 (or 32813 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 31490880 is about 5611.6735471693. The cubic root of 31490880 is about 315.7874979993.

The spelling of 31490880 in words is "thirty-one million, four hundred ninety thousand, eight hundred eighty".