42636645 has 64 divisors (see below), whose sum is σ = 79315200. Its totient is φ = 21715200.

The previous prime is 42636637. The next prime is 42636667. The reversal of 42636645 is 54663624.

42636645 is a `hidden beast` number, since 4 + 2 + 6 + 3 + 6 + 645 = 666.

It is not a de Polignac number, because 42636645 - 2³ = 42636637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 422095 + ... + 422195.

It is an arithmetic number, because the mean of its divisors is an integer number (1239300).

Almost surely, 2^42636645 is an apocalyptic number.

42636645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42636645 is a deficient number, since it is larger than the sum of its proper divisors (36678555).

42636645 is a wasteful number, since it uses less digits than its factorization.

42636645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 221 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 42636645 is about 6529.6741878902. The cubic root of 42636645 is about 349.3502093471.

The spelling of 42636645 in words is "forty-two million, six hundred thirty-six thousand, six hundred forty-five".