31854564 has 72 divisors (see below), whose sum is σ = 96882240. Its totient is φ = 8620992.

The previous prime is 31854553. The next prime is 31854569. The reversal of 31854564 is 46545813.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (31854569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1462 + ... + 8114.

Almost surely, 2^31854564 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 31854564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48441120).

31854564 is an abundant number, since it is smaller than the sum of its proper divisors (65027676).

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

31854564 is a wasteful number, since it uses less digits than its factorization.

31854564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6689 (or 6684 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 31854564 is about 5643.9847625592. The cubic root of 31854564 is about 316.9985106094.

The spelling of 31854564 in words is "thirty-one million, eight hundred fifty-four thousand, five hundred sixty-four".