8633640621 has 12 divisors (see below), whose sum is σ = 12228502592. Its totient is φ = 5417185728.

The previous prime is 8633640611. The next prime is 8633640623. The reversal of 8633640621 is 1260463368.

It is not a de Polignac number, because 8633640621 - 2²⁵ = 8600086189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8633640621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8633640623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4978165 + ... + 4979898.

Almost surely, 2^8633640621 is an apocalyptic number.

It is an amenable number.

8633640621 is a deficient number, since it is larger than the sum of its proper divisors (3594861971).

8633640621 is a wasteful number, since it uses less digits than its factorization.

8633640621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9958100 (or 9958083 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 8633640621 is about 92917.3859996072. The cubic root of 8633640621 is about 2051.4675686876.

The spelling of 8633640621 in words is "eight billion, six hundred thirty-three million, six hundred forty thousand, six hundred twenty-one".