31896090 has 24 divisors (see below), whose sum is σ = 82930068. Its totient is φ = 8505600.

The previous prime is 31896083. The next prime is 31896091. The reversal of 31896090 is 9069813.

It can be written as a sum of positive squares in 2 ways, for example, as 26656569 + 5239521 = 5163^2 + 2289^2 .

It is not an unprimeable number, because it can be changed into a prime (31896091) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 177111 + ... + 177290.

Almost surely, 2^31896090 is an apocalyptic number.

31896090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31896090 is an abundant number, since it is smaller than the sum of its proper divisors (51033978).

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

31896090 is a wasteful number, since it uses less digits than its factorization.

31896090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354414 (or 354411 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 31896090 is about 5647.6623482641. The cubic root of 31896090 is about 317.1361985106.

The spelling of 31896090 in words is "thirty-one million, eight hundred ninety-six thousand, ninety".