31250664 has 64 divisors (see below), whose sum is σ = 87480000. Its totient is φ = 10336320.

The previous prime is 31250663. The next prime is 31250669. The reversal of 31250664 is 46605213.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31250663) 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, 31699 + ... + 32669.

It is an arithmetic number, because the mean of its divisors is an integer number (1366875).

Almost surely, 2^31250664 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 31250664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43740000).

31250664 is an abundant number, since it is smaller than the sum of its proper divisors (56229336).

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

31250664 is a wasteful number, since it uses less digits than its factorization.

31250664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1125 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 31250664 is about 5590.2293333995. The cubic root of 31250664 is about 314.9824933581.

Adding to 31250664 its reverse (46605213), we get a palindrome (77855877).

The spelling of 31250664 in words is "thirty-one million, two hundred fifty thousand, six hundred sixty-four".