31297264 has 40 divisors (see below), whose sum is σ = 64460160. Its totient is φ = 14692608.

The previous prime is 31297247. The next prime is 31297267. The reversal of 31297264 is 46279213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31297267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16257 + ... + 18079.

It is an arithmetic number, because the mean of its divisors is an integer number (1611504).

Almost surely, 2^31297264 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 31297264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32230080).

31297264 is an abundant number, since it is smaller than the sum of its proper divisors (33162896).

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

31297264 is a wasteful number, since it uses less digits than its factorization.

31297264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897 (or 1891 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 31297264 is about 5594.3957671942. The cubic root of 31297264 is about 315.1389795728.

The spelling of 31297264 in words is "thirty-one million, two hundred ninety-seven thousand, two hundred sixty-four".