670985978 has 8 divisors (see below), whose sum is σ = 1083900468. Its totient is φ = 309685824.

The previous prime is 670985933. The next prime is 670985983. The reversal of 670985978 is 879589076.

It can be written as a sum of positive squares in 2 ways, for example, as 657050689 + 13935289 = 25633^2 + 3733^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 12903551 + ... + 12903602.

Almost surely, 2^670985978 is an apocalyptic number.

670985978 is a deficient number, since it is larger than the sum of its proper divisors (412914490).

670985978 is a wasteful number, since it uses less digits than its factorization.

670985978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25807168.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The square root of 670985978 is about 25903.3970359102. The cubic root of 670985978 is about 875.4630378623.

The spelling of 670985978 in words is "six hundred seventy million, nine hundred eighty-five thousand, nine hundred seventy-eight".