31328290 has 32 divisors (see below), whose sum is σ = 66530304. Its totient is φ = 10393920.

The previous prime is 31328287. The next prime is 31328309. The reversal of 31328290 is 9282313.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5049 + ... + 9388.

It is an arithmetic number, because the mean of its divisors is an integer number (2079072).

Almost surely, 2^31328290 is an apocalyptic number.

31328290 is an abundant number, since it is smaller than the sum of its proper divisors (35202014).

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

31328290 is a wasteful number, since it uses less digits than its factorization.

31328290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14482.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 31328290 is about 5597.1680339257. The cubic root of 31328290 is about 315.2430810351.

The spelling of 31328290 in words is "thirty-one million, three hundred twenty-eight thousand, two hundred ninety".