31487880 has 32 divisors (see below), whose sum is σ = 94464000. Its totient is φ = 8396736.

The previous prime is 31487873. The next prime is 31487917. The reversal of 31487880 is 8878413.

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, 131080 + ... + 131319.

It is an arithmetic number, because the mean of its divisors is an integer number (2952000).

Almost surely, 2^31487880 is an apocalyptic number.

31487880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31487880 is an abundant number, since it is smaller than the sum of its proper divisors (62976120).

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

31487880 is a wasteful number, since it uses less digits than its factorization.

31487880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262413 (or 262409 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 31487880 is about 5611.4062408633. The cubic root of 31487880 is about 315.7774697776. Note that the first 3 decimals are identical.

The spelling of 31487880 in words is "thirty-one million, four hundred eighty-seven thousand, eight hundred eighty".