72636645 has 32 divisors (see below), whose sum is σ = 122072832. Its totient is φ = 36810752.

The previous prime is 72636637. The next prime is 72636647. The reversal of 72636645 is 54663627.

It is a cyclic number.

It is not a de Polignac number, because 72636645 - 2³ = 72636637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72636647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59077 + ... + 60293.

It is an arithmetic number, because the mean of its divisors is an integer number (3814776).

Almost surely, 2^72636645 is an apocalyptic number.

It is an amenable number.

72636645 is a deficient number, since it is larger than the sum of its proper divisors (49436187).

72636645 is a wasteful number, since it uses less digits than its factorization.

72636645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421.

The product of its digits is 181440, while the sum is 39.

The square root of 72636645 is about 8522.7134763525. The cubic root of 72636645 is about 417.2393487019.

The spelling of 72636645 in words is "seventy-two million, six hundred thirty-six thousand, six hundred forty-five".