690698391 has 8 divisors (see below), whose sum is σ = 921283200. Its totient is φ = 460289592.

The previous prime is 690698387. The next prime is 690698399. The reversal of 690698391 is 193896096.

690698391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 690698391 - 2² = 690698387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690698399) 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, 34555 + ... + 50748.

It is an arithmetic number, because the mean of its divisors is an integer number (115160400).

Almost surely, 2^690698391 is an apocalyptic number.

690698391 is a deficient number, since it is larger than the sum of its proper divisors (230584809).

690698391 is a wasteful number, since it uses less digits than its factorization.

690698391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88005.

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 690698391 is about 26281.1413564936. The cubic root of 690698391 is about 883.9536255813.

The spelling of 690698391 in words is "six hundred ninety million, six hundred ninety-eight thousand, three hundred ninety-one".