670446656 has 56 divisors (see below), whose sum is σ = 1454993280. Its totient is φ = 303987200.

The previous prime is 670446653. The next prime is 670446671. The reversal of 670446656 is 656644076.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (670446653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357401 + ... + 359271.

Almost surely, 2^670446656 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 670446656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727496640).

670446656 is an abundant number, since it is smaller than the sum of its proper divisors (784546624).

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

670446656 is a wasteful number, since it uses less digits than its factorization.

670446656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403 (or 2393 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 44.

The square root of 670446656 is about 25892.9846869765. The cubic root of 670446656 is about 875.2284164489.

The spelling of 670446656 in words is "six hundred seventy million, four hundred forty-six thousand, six hundred fifty-six".