8638947902 has 32 divisors (see below), whose sum is σ = 14789827584. Its totient is φ = 3749184000.

The previous prime is 8638947899. The next prime is 8638947991. The reversal of 8638947902 is 2097498368.

It is a happy number.

8638947902 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500252 + ... + 517232.

It is an arithmetic number, because the mean of its divisors is an integer number (462182112).

Almost surely, 2^8638947902 is an apocalyptic number.

8638947902 is a deficient number, since it is larger than the sum of its proper divisors (6150879682).

8638947902 is a wasteful number, since it uses less digits than its factorization.

8638947902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18164.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The square root of 8638947902 is about 92945.9407505244. The cubic root of 8638947902 is about 2051.8878427110.

The spelling of 8638947902 in words is "eight billion, six hundred thirty-eight million, nine hundred forty-seven thousand, nine hundred two".