31429880 has 32 divisors (see below), whose sum is σ = 70943040. Its totient is φ = 12531840.

The previous prime is 31429873. The next prime is 31429897. The reversal of 31429880 is 8892413.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31429880.

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, 13610 + ... + 15750.

It is an arithmetic number, because the mean of its divisors is an integer number (2216970).

Almost surely, 2^31429880 is an apocalyptic number.

It is an amenable number.

31429880 is an abundant number, since it is smaller than the sum of its proper divisors (39513160).

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

31429880 is a wasteful number, since it uses less digits than its factorization.

31429880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519 (or 2515 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 31429880 is about 5606.2358138059. The cubic root of 31429880 is about 315.5834655014.

The spelling of 31429880 in words is "thirty-one million, four hundred twenty-nine thousand, eight hundred eighty".