31428860 has 24 divisors (see below), whose sum is σ = 66933216. Its totient is φ = 12393920.

The previous prime is 31428857. The next prime is 31428893. The reversal of 31428860 is 6882413.

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, 9647 + ... + 12486.

It is an arithmetic number, because the mean of its divisors is an integer number (2788884).

Almost surely, 2^31428860 is an apocalyptic number.

It is an amenable number.

31428860 is an abundant number, since it is smaller than the sum of its proper divisors (35504356).

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

31428860 is a wasteful number, since it uses less digits than its factorization.

31428860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22213 (or 22211 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 31428860 is about 5606.1448429380. The cubic root of 31428860 is about 315.5800515673.

The spelling of 31428860 in words is "thirty-one million, four hundred twenty-eight thousand, eight hundred sixty".