42639564 has 24 divisors (see below), whose sum is σ = 108537408. Its totient is φ = 12921040.

The previous prime is 42639563. The next prime is 42639589. The reversal of 42639564 is 46593624.

It is a super-2 number, since 2×42639564² = 3636264836220192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42639563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161382 + ... + 161645.

It is an arithmetic number, because the mean of its divisors is an integer number (4522392).

Almost surely, 2^42639564 is an apocalyptic number.

42639564 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

42639564 is an abundant number, since it is smaller than the sum of its proper divisors (65897844).

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

42639564 is a wasteful number, since it uses less digits than its factorization.

42639564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323045 (or 323043 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 42639564 is about 6529.8977021084. The cubic root of 42639564 is about 349.3581815972.

The spelling of 42639564 in words is "forty-two million, six hundred thirty-nine thousand, five hundred sixty-four".