42815644 has 12 divisors (see below), whose sum is σ = 76755168. Its totient is φ = 20885600.

The previous prime is 42815621. The next prime is 42815657. The reversal of 42815644 is 44651824.

It is a super-2 number, since 2×42815644² = 3666358742269472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130372 + ... + 130699.

It is an arithmetic number, because the mean of its divisors is an integer number (6396264).

Almost surely, 2^42815644 is an apocalyptic number.

It is an amenable number.

42815644 is a deficient number, since it is larger than the sum of its proper divisors (33939524).

42815644 is a wasteful number, since it uses less digits than its factorization.

42815644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261116 (or 261114 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 42815644 is about 6543.3664118709. The cubic root of 42815644 is about 349.8384124848.

The spelling of 42815644 in words is "forty-two million, eight hundred fifteen thousand, six hundred forty-four".