31620090 has 16 divisors (see below), whose sum is σ = 75888288. Its totient is φ = 8432016.

The previous prime is 31620067. The next prime is 31620107. The reversal of 31620090 is 9002613.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526972 + ... + 527031.

It is an arithmetic number, because the mean of its divisors is an integer number (4743018).

Almost surely, 2^31620090 is an apocalyptic number.

31620090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31620090 is an abundant number, since it is smaller than the sum of its proper divisors (44268198).

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

31620090 is a wasteful number, since it uses less digits than its factorization.

31620090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054013.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31620090 is about 5623.1743704068. The cubic root of 31620090 is about 316.2188104243.

The spelling of 31620090 in words is "thirty-one million, six hundred twenty thousand, ninety".