670640840 has 16 divisors (see below), whose sum is σ = 1508941980. Its totient is φ = 268256320.

The previous prime is 670640833. The next prime is 670640869. The reversal of 670640840 is 48046076.

It can be written as a sum of positive squares in 2 ways, for example, as 666775684 + 3865156 = 25822^2 + 1966^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 670640840.

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, 8382971 + ... + 8383050.

Almost surely, 2^670640840 is an apocalyptic number.

It is an amenable number.

670640840 is an abundant number, since it is smaller than the sum of its proper divisors (838301140).

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

670640840 is a wasteful number, since it uses less digits than its factorization.

670640840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16766032 (or 16766028 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 670640840 is about 25896.7341570322. The cubic root of 670640840 is about 875.3129068642.

The spelling of 670640840 in words is "six hundred seventy million, six hundred forty thousand, eight hundred forty".