689706695 has 4 divisors (see below), whose sum is σ = 827648040. Its totient is φ = 551765352.

The previous prime is 689706691. The next prime is 689706697. The reversal of 689706695 is 596607986.

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 689706695 - 2² = 689706691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689706695.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689706691) 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, 68970665 + ... + 68970674.

It is an arithmetic number, because the mean of its divisors is an integer number (206912010).

Almost surely, 2^689706695 is an apocalyptic number.

689706695 is a deficient number, since it is larger than the sum of its proper divisors (137941345).

689706695 is a wasteful number, since it uses less digits than its factorization.

689706695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137941344.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The square root of 689706695 is about 26262.2675144398. The cubic root of 689706695 is about 883.5303664740.

The spelling of 689706695 in words is "six hundred eighty-nine million, seven hundred six thousand, six hundred ninety-five".