31628490 has 32 divisors (see below), whose sum is σ = 76066560. Its totient is φ = 8416704.

The previous prime is 31628479. The next prime is 31628501. The reversal of 31628490 is 9482613.

It is an interprime number because it is at equal distance from previous prime (31628479) and next prime (31628501).

It is a super-2 number, since 2×31628490² = 2000722759360200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20527 + ... + 22013.

It is an arithmetic number, because the mean of its divisors is an integer number (2377080).

Almost surely, 2^31628490 is an apocalyptic number.

31628490 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31628490 is an abundant number, since it is smaller than the sum of its proper divisors (44438070).

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

31628490 is a wasteful number, since it uses less digits than its factorization.

31628490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 31628490 is about 5623.9212298893. The cubic root of 31628490 is about 316.2468095311.

The spelling of 31628490 in words is "thirty-one million, six hundred twenty-eight thousand, four hundred ninety".