670864691 has 4 divisors (see below), whose sum is σ = 766702512. Its totient is φ = 575026872.

The previous prime is 670864679. The next prime is 670864697. The reversal of 670864691 is 196468076.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 670864691 - 2¹⁰ = 670863667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670864697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47918900 + ... + 47918913.

It is an arithmetic number, because the mean of its divisors is an integer number (191675628).

Almost surely, 2^670864691 is an apocalyptic number.

670864691 is a deficient number, since it is larger than the sum of its proper divisors (95837821).

670864691 is an equidigital number, since it uses as much as digits as its factorization.

670864691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95837820.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 670864691 is about 25901.0557892917. The cubic root of 670864691 is about 875.4102853025.

The spelling of 670864691 in words is "six hundred seventy million, eight hundred sixty-four thousand, six hundred ninety-one".