38631564 has 18 divisors (see below), whose sum is σ = 97652100. Its totient is φ = 12877176.

The previous prime is 38631547. The next prime is 38631569. The reversal of 38631564 is 46513683.

38631564 is a `hidden beast` number, since 38 + 63 + 1 + 564 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1073099 = 38631564 / (3 + 8 + 6 + 3 + 1 + 5 + 6 + 4).

It is not an unprimeable number, because it can be changed into a prime (38631569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 536514 + ... + 536585.

Almost surely, 2^38631564 is an apocalyptic number.

It is an amenable number.

38631564 is an abundant number, since it is smaller than the sum of its proper divisors (59020536).

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

38631564 is a wasteful number, since it uses less digits than its factorization.

38631564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073109 (or 1073104 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 38631564 is about 6215.4295105005. The cubic root of 38631564 is about 338.0498625130.

The spelling of 38631564 in words is "thirty-eight million, six hundred thirty-one thousand, five hundred sixty-four".