31090304 has 48 divisors (see below), whose sum is σ = 72064530. Its totient is φ = 13321728.

The previous prime is 31090271. The next prime is 31090309. The reversal of 31090304 is 40309013.

It can be written as a sum of positive squares in only one way, i.e., 21603904 + 9486400 = 4648^2 + 3080^2 .

It is not an unprimeable number, because it can be changed into a prime (31090309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3794 + ... + 8750.

Almost surely, 2^31090304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31090304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36032265).

31090304 is an abundant number, since it is smaller than the sum of its proper divisors (40974226).

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

31090304 is an equidigital number, since it uses as much as digits as its factorization.

31090304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4985 (or 4966 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 31090304 is about 5575.8680041766. The cubic root of 31090304 is about 314.4428009679.

Adding to 31090304 its reverse (40309013), we get a palindrome (71399317).

The spelling of 31090304 in words is "thirty-one million, ninety thousand, three hundred four".