31868564 has 48 divisors (see below), whose sum is σ = 71030400. Its totient is φ = 12168576.

The previous prime is 31868561. The next prime is 31868647. The reversal of 31868564 is 46586813.

It is a super-3 number, since 3×31868564³ (a number of 23 digits) contains 333 as substring.

Its product of digits (138240) is a multiple of the sum of its prime factors (3072).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31868561) 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, 9047 + ... + 12065.

It is an arithmetic number, because the mean of its divisors is an integer number (1479800).

Almost surely, 2^31868564 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 31868564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35515200).

31868564 is an abundant number, since it is smaller than the sum of its proper divisors (39161836).

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

31868564 is a wasteful number, since it uses less digits than its factorization.

31868564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072 (or 3070 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 31868564 is about 5645.2248848031. The cubic root of 31868564 is about 317.0449438212.

The spelling of 31868564 in words is "thirty-one million, eight hundred sixty-eight thousand, five hundred sixty-four".