689394691 has 8 divisors (see below), whose sum is σ = 712889424. Its totient is φ = 666288480.

The previous prime is 689394683. The next prime is 689394701. The reversal of 689394691 is 196493986.

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

It is a cyclic number.

It is not a de Polignac number, because 689394691 - 2³ = 689394683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689394631) 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, 93520 + ... + 100621.

It is an arithmetic number, because the mean of its divisors is an integer number (89111178).

Almost surely, 2^689394691 is an apocalyptic number.

689394691 is a deficient number, since it is larger than the sum of its proper divisors (23494733).

689394691 is a wasteful number, since it uses less digits than its factorization.

689394691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194261.

The product of its digits is 2519424, while the sum is 55.

The square root of 689394691 is about 26256.3266852010. The cubic root of 689394691 is about 883.3971182452.

The spelling of 689394691 in words is "six hundred eighty-nine million, three hundred ninety-four thousand, six hundred ninety-one".