42556636 has 12 divisors (see below), whose sum is σ = 74571840. Its totient is φ = 21250400.

The previous prime is 42556609. The next prime is 42556639. The reversal of 42556636 is 63665524.

42556636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×42556636² = 3622134535272992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42556595 and 42556604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42556639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3340 + ... + 9811.

It is an arithmetic number, because the mean of its divisors is an integer number (6214320).

Almost surely, 2^42556636 is an apocalyptic number.

It is an amenable number.

42556636 is a deficient number, since it is larger than the sum of its proper divisors (32015204).

42556636 is a wasteful number, since it uses less digits than its factorization.

42556636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13964 (or 13962 counting only the distinct ones).

The product of its digits is 129600, while the sum is 37.

The square root of 42556636 is about 6523.5447419329. The cubic root of 42556636 is about 349.1315503126.

The spelling of 42556636 in words is "forty-two million, five hundred fifty-six thousand, six hundred thirty-six".