8638894521 has 24 divisors (see below), whose sum is σ = 13142923040. Its totient is φ = 5452920000.

The previous prime is 8638894487. The next prime is 8638894547. The reversal of 8638894521 is 1254988368.

8638894521 is a `hidden beast` number, since 8 + 6 + 38 + 89 + 4 + 521 = 666.

8638894521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8638894521 - 2⁹ = 8638894009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8638894571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 293946 + ... + 321996.

Almost surely, 2^8638894521 is an apocalyptic number.

It is an amenable number.

8638894521 is a deficient number, since it is larger than the sum of its proper divisors (4504028519).

8638894521 is a wasteful number, since it uses less digits than its factorization.

8638894521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29877 (or 29874 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The square root of 8638894521 is about 92945.6535885353. The cubic root of 8638894521 is about 2051.8836164228.

The spelling of 8638894521 in words is "eight billion, six hundred thirty-eight million, eight hundred ninety-four thousand, five hundred twenty-one".