670474640 has 80 divisors (see below), whose sum is σ = 1742138496. Its totient is φ = 237849600.

The previous prime is 670474627. The next prime is 670474661. The reversal of 670474640 is 46474076.

670474640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 670474594 and 670474603.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26789 + ... + 45371.

Almost surely, 2^670474640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 670474640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (871069248).

670474640 is an abundant number, since it is smaller than the sum of its proper divisors (1071663856).

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

670474640 is a wasteful number, since it uses less digits than its factorization.

670474640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18648 (or 18642 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 38.

The square root of 670474640 is about 25893.5250593657. The cubic root of 670474640 is about 875.2405934313.

The spelling of 670474640 in words is "six hundred seventy million, four hundred seventy-four thousand, six hundred forty".