31313304 has 160 divisors (see below), whose sum is σ = 100362240. Its totient is φ = 9028800.

The previous prime is 31313297. The next prime is 31313351. The reversal of 31313304 is 40331313.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 163849 + ... + 164039.

It is an arithmetic number, because the mean of its divisors is an integer number (627264).

Almost surely, 2^31313304 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 31313304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50181120).

31313304 is an abundant number, since it is smaller than the sum of its proper divisors (69048936).

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

31313304 is a wasteful number, since it uses less digits than its factorization.

31313304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 31313304 is about 5595.8291610806. The cubic root of 31313304 is about 315.1928071314.

Adding to 31313304 its reverse (40331313), we get a palindrome (71644617).

Subtracting 31313304 from its reverse (40331313), we obtain a square (9018009 = 3003²).

The spelling of 31313304 in words is "thirty-one million, three hundred thirteen thousand, three hundred four".