31256990 has 16 divisors (see below), whose sum is σ = 58078080. Its totient is φ = 12099360.

The previous prime is 31256987. The next prime is 31257019. The reversal of 31256990 is 9965213.

It is a self number, because there is not a number n which added to its sum of digits gives 31256990.

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, 50105 + ... + 50724.

It is an arithmetic number, because the mean of its divisors is an integer number (3629880).

Almost surely, 2^31256990 is an apocalyptic number.

31256990 is a deficient number, since it is larger than the sum of its proper divisors (26821090).

31256990 is a wasteful number, since it uses less digits than its factorization.

31256990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100867.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 31256990 is about 5590.7951133985. The cubic root of 31256990 is about 315.0037456513.

The spelling of 31256990 in words is "thirty-one million, two hundred fifty-six thousand, nine hundred ninety".