690659691 has 8 divisors (see below), whose sum is σ = 930373584. Its totient is φ = 455692800.

The previous prime is 690659657. The next prime is 690659701. The reversal of 690659691 is 196956096.

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

It is not a de Polignac number, because 690659691 - 2¹⁴ = 690643307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (690659591) 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, 1186410 + ... + 1186991.

It is an arithmetic number, because the mean of its divisors is an integer number (116296698).

Almost surely, 2^690659691 is an apocalyptic number.

690659691 is a deficient number, since it is larger than the sum of its proper divisors (239713893).

690659691 is a wasteful number, since it uses less digits than its factorization.

690659691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373501.

The product of its (nonzero) digits is 787320, while the sum is 51.

The square root of 690659691 is about 26280.4050767868. The cubic root of 690659691 is about 883.9371158936.

The spelling of 690659691 in words is "six hundred ninety million, six hundred fifty-nine thousand, six hundred ninety-one".