670508991 has 6 divisors (see below), whose sum is σ = 968513000. Its totient is φ = 447005988.

The previous prime is 670508977. The next prime is 670509043. The reversal of 670508991 is 199805076.

It is not a de Polignac number, because 670508991 - 2⁹ = 670508479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670508941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37250491 + ... + 37250508.

Almost surely, 2^670508991 is an apocalyptic number.

670508991 is a deficient number, since it is larger than the sum of its proper divisors (298004009).

670508991 is a wasteful number, since it uses less digits than its factorization.

670508991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74501005 (or 74501002 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 670508991 is about 25894.1883634147. The cubic root of 670508991 is about 875.2555404923.

The spelling of 670508991 in words is "six hundred seventy million, five hundred eight thousand, nine hundred ninety-one".