8643640670 has 48 divisors (see below), whose sum is σ = 18587918880. Its totient is φ = 2883432384.

The previous prime is 8643640669. The next prime is 8643640697. The reversal of 8643640670 is 760463468.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220250 + ... + 256509.

It is an arithmetic number, because the mean of its divisors is an integer number (387248310).

Almost surely, 2^8643640670 is an apocalyptic number.

8643640670 is an abundant number, since it is smaller than the sum of its proper divisors (9944278210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8643640670 is a wasteful number, since it uses less digits than its factorization.

8643640670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476817 (or 476810 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The square root of 8643640670 is about 92971.1819328979. The cubic root of 8643640670 is about 2052.2593111935.

The spelling of 8643640670 in words is "eight billion, six hundred forty-three million, six hundred forty thousand, six hundred seventy".