670400691 has 8 divisors (see below), whose sum is σ = 897346704. Its totient is φ = 445194240.

The previous prime is 670400677. The next prime is 670400713. The reversal of 670400691 is 196004076.

It is a happy number.

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

It is not a de Polignac number, because 670400691 - 2²³ = 662012083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (670400611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433990 + ... + 435531.

It is an arithmetic number, because the mean of its divisors is an integer number (112168338).

Almost surely, 2^670400691 is an apocalyptic number.

670400691 is a deficient number, since it is larger than the sum of its proper divisors (226946013).

670400691 is a wasteful number, since it uses less digits than its factorization.

670400691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869781.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 670400691 is about 25892.0970761350. The cubic root of 670400691 is about 875.2084144631.

The spelling of 670400691 in words is "six hundred seventy million, four hundred thousand, six hundred ninety-one".