640716170 has 16 divisors (see below), whose sum is σ = 1163871720. Its totient is φ = 253934784.

The previous prime is 640716151. The next prime is 640716203. The reversal of 640716170 is 71617046.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 609053041 + 31663129 = 24679^2 + 5627^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292817 + ... + 294996.

Almost surely, 2^640716170 is an apocalyptic number.

640716170 is a deficient number, since it is larger than the sum of its proper divisors (523155550).

640716170 is a wasteful number, since it uses less digits than its factorization.

640716170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587929.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 640716170 is about 25312.3718762189. The cubic root of 640716170 is about 862.0952023303.

The spelling of 640716170 in words is "six hundred forty million, seven hundred sixteen thousand, one hundred seventy".