31872090 has 32 divisors (see below), whose sum is σ = 77215680. Its totient is φ = 8418944.

The previous prime is 31872079. The next prime is 31872107. The reversal of 31872090 is 9027813.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 1755 + ... + 8174.

It is an arithmetic number, because the mean of its divisors is an integer number (2412990).

Almost surely, 2^31872090 is an apocalyptic number.

31872090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31872090 is an abundant number, since it is smaller than the sum of its proper divisors (45343590).

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

31872090 is a wasteful number, since it uses less digits than its factorization.

31872090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10046.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 31872090 is about 5645.5371755042. The cubic root of 31872090 is about 317.0566362134.

The spelling of 31872090 in words is "thirty-one million, eight hundred seventy-two thousand, ninety".