31253664 has 96 divisors (see below), whose sum is σ = 89752320. Its totient is φ = 9464832.

The previous prime is 31253639. The next prime is 31253669. The reversal of 31253664 is 46635213.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31253669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98434 + ... + 98750.

It is an arithmetic number, because the mean of its divisors is an integer number (934920).

Almost surely, 2^31253664 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 31253664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44876160).

31253664 is an abundant number, since it is smaller than the sum of its proper divisors (58498656).

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

31253664 is a wasteful number, since it uses less digits than its factorization.

31253664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 414 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 31253664 is about 5590.4976522667. The cubic root of 31253664 is about 314.9925722612.

Adding to 31253664 its reverse (46635213), we get a palindrome (77888877).

The spelling of 31253664 in words is "thirty-one million, two hundred fifty-three thousand, six hundred sixty-four".