31797090 has 64 divisors (see below), whose sum is σ = 91324800. Its totient is φ = 7826112.

The previous prime is 31797037. The next prime is 31797091. The reversal of 31797090 is 9079713.

It is a super-2 number, since 2×31797090² = 2022109864936200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31797091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1020 + ... + 8039.

It is an arithmetic number, because the mean of its divisors is an integer number (1426950).

Almost surely, 2^31797090 is an apocalyptic number.

31797090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31797090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45662400).

31797090 is an abundant number, since it is smaller than the sum of its proper divisors (59527710).

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

31797090 is a wasteful number, since it uses less digits than its factorization.

31797090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9088 (or 9082 counting only the distinct ones).

The product of its (nonzero) digits is 11907, while the sum is 36.

The square root of 31797090 is about 5638.8908483850. The cubic root of 31797090 is about 316.8077463097.

The spelling of 31797090 in words is "thirty-one million, seven hundred ninety-seven thousand, ninety".