42644538 has 24 divisors (see below), whose sum is σ = 93076308. Its totient is φ = 14110272.

The previous prime is 42644527. The next prime is 42644543. The reversal of 42644538 is 83544624.

42644538 is a `hidden beast` number, since 4 + 2 + 644 + 5 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 40106889 + 2537649 = 6333^2 + 1593^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6181 + ... + 11112.

Almost surely, 2^42644538 is an apocalyptic number.

42644538 is an abundant number, since it is smaller than the sum of its proper divisors (50431770).

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

42644538 is a wasteful number, since it uses less digits than its factorization.

42644538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17438 (or 17435 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 42644538 is about 6530.2785545488. The cubic root of 42644538 is about 349.3717655387.

The spelling of 42644538 in words is "forty-two million, six hundred forty-four thousand, five hundred thirty-eight".