689662718 has 4 divisors (see below), whose sum is σ = 1034494080. Its totient is φ = 344831358.

The previous prime is 689662697. The next prime is 689662723. The reversal of 689662718 is 817266986.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 689662718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172415678 + ... + 172415681.

It is an arithmetic number, because the mean of its divisors is an integer number (258623520).

Almost surely, 2^689662718 is an apocalyptic number.

689662718 is a deficient number, since it is larger than the sum of its proper divisors (344831362).

689662718 is a wasteful number, since it uses less digits than its factorization.

689662718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344831361.

The product of its digits is 1741824, while the sum is 53.

The square root of 689662718 is about 26261.4302352328. The cubic root of 689662718 is about 883.5115875539.

The spelling of 689662718 in words is "six hundred eighty-nine million, six hundred sixty-two thousand, seven hundred eighteen".