45638644 has 12 divisors (see below), whose sum is σ = 80377444. Its totient is φ = 22673664.

The previous prime is 45638639. The next prime is 45638657. The reversal of 45638644 is 44683654.

It can be written as a sum of positive squares in 2 ways, for example, as 17123044 + 28515600 = 4138^2 + 5340^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 45638597 and 45638606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35709 + ... + 36964.

Almost surely, 2^45638644 is an apocalyptic number.

It is an amenable number.

45638644 is a deficient number, since it is larger than the sum of its proper divisors (34738800).

45638644 is a wasteful number, since it uses less digits than its factorization.

45638644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72834 (or 72832 counting only the distinct ones).

The product of its digits is 276480, while the sum is 40.

The square root of 45638644 is about 6755.6379417491. The cubic root of 45638644 is about 357.3640906763.

The spelling of 45638644 in words is "forty-five million, six hundred thirty-eight thousand, six hundred forty-four".