670691 has 4 divisors (see below), whose sum is σ = 766512. Its totient is φ = 574872.

The previous prime is 670673. The next prime is 670693. The reversal of 670691 is 196076.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 670691 - 2⁶ = 670627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670693) 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, 47900 + ... + 47913.

It is an arithmetic number, because the mean of its divisors is an integer number (191628).

2⁶⁷⁰⁶⁹¹ is an apocalyptic number.

670691 is a deficient number, since it is larger than the sum of its proper divisors (95821).

670691 is an equidigital number, since it uses as much as digits as its factorization.

670691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95820.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 670691 is about 818.9572638423. The cubic root of 670691 is about 87.5334729077.

The spelling of 670691 in words is "six hundred seventy thousand, six hundred ninety-one".