670635920 has 20 divisors (see below), whose sum is σ = 1559228700. Its totient is φ = 268254336.

The previous prime is 670635883. The next prime is 670635929. The reversal of 670635920 is 29536076.

It can be written as a sum of positive squares in 2 ways, for example, as 451477504 + 219158416 = 21248^2 + 14804^2 .

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

It is not an unprimeable number, because it can be changed into a prime (670635929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4191395 + ... + 4191554.

It is an arithmetic number, because the mean of its divisors is an integer number (77961435).

Almost surely, 2^670635920 is an apocalyptic number.

It is an amenable number.

670635920 is an abundant number, since it is smaller than the sum of its proper divisors (888592780).

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

670635920 is a wasteful number, since it uses less digits than its factorization.

670635920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8382962 (or 8382956 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 670635920 is about 25896.6391641850. The cubic root of 670635920 is about 875.3107663494.

The spelling of 670635920 in words is "six hundred seventy million, six hundred thirty-five thousand, nine hundred twenty".