31107664 has 20 divisors (see below), whose sum is σ = 68881504. Its totient is φ = 13331808.

The previous prime is 31107647. The next prime is 31107667. The reversal of 31107664 is 46670113.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31107667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138762 + ... + 138985.

Almost surely, 2^31107664 is an apocalyptic number.

It is an amenable number.

31107664 is an abundant number, since it is smaller than the sum of its proper divisors (37773840).

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

31107664 is a wasteful number, since it uses less digits than its factorization.

31107664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277762 (or 277756 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 31107664 is about 5577.4244952308. The cubic root of 31107664 is about 314.5013155811.

Adding to 31107664 its reverse (46670113), we get a palindrome (77777777).

The spelling of 31107664 in words is "thirty-one million, one hundred seven thousand, six hundred sixty-four".