670705990 has 32 divisors (see below), whose sum is σ = 1283553216. Its totient is φ = 251771520.

The previous prime is 670705951. The next prime is 670705991. The reversal of 670705990 is 99507076.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670705991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15321 + ... + 39700.

It is an arithmetic number, because the mean of its divisors is an integer number (40111038).

Almost surely, 2^670705990 is an apocalyptic number.

670705990 is a deficient number, since it is larger than the sum of its proper divisors (612847226).

670705990 is a wasteful number, since it uses less digits than its factorization.

670705990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55104.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 670705990 is about 25897.9920071036. The cubic root of 670705990 is about 875.3412502963.

The spelling of 670705990 in words is "six hundred seventy million, seven hundred five thousand, nine hundred ninety".