680070640 has 20 divisors (see below), whose sum is σ = 1581164424. Its totient is φ = 272028224.

The previous prime is 680070637. The next prime is 680070691. The reversal of 680070640 is 46070086.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4250362 + ... + 4250521.

Almost surely, 2^680070640 is an apocalyptic number.

It is an amenable number.

680070640 is an abundant number, since it is smaller than the sum of its proper divisors (901093784).

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

680070640 is a wasteful number, since it uses less digits than its factorization.

680070640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8500896 (or 8500890 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 680070640 is about 26078.1640458066. The cubic root of 680070640 is about 879.3963835781.

The spelling of 680070640 in words is "six hundred eighty million, seventy thousand, six hundred forty".