45218637 has 6 divisors (see below), whose sum is σ = 65315822. Its totient is φ = 30145752.

The previous prime is 45218617. The next prime is 45218647. The reversal of 45218637 is 73681254.

45218637 is a `hidden beast` number, since 4 + 5 + 2 + 18 + 637 = 666.

It can be written as a sum of positive squares in only one way, i.e., 42850116 + 2368521 = 6546^2 + 1539^2 .

It is not a de Polignac number, because 45218637 - 2²⁴ = 28441421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45218617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2512138 + ... + 2512155.

Almost surely, 2^45218637 is an apocalyptic number.

It is an amenable number.

45218637 is a deficient number, since it is larger than the sum of its proper divisors (20097185).

45218637 is a wasteful number, since it uses less digits than its factorization.

45218637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024299 (or 5024296 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 45218637 is about 6724.4804260255. The cubic root of 45218637 is about 356.2644507527.

The spelling of 45218637 in words is "forty-five million, two hundred eighteen thousand, six hundred thirty-seven".