689659769 has 4 divisors (see below), whose sum is σ = 689775360. Its totient is φ = 689544180.

The previous prime is 689659753. The next prime is 689659783. The reversal of 689659769 is 967956986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 689659769 - 2⁴ = 689659753 is a prime.

It is a super-2 number, since 2×689659769² = 951261193954266722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689649769) 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, 48329 + ... + 60950.

It is an arithmetic number, because the mean of its divisors is an integer number (172443840).

Almost surely, 2^689659769 is an apocalyptic number.

It is an amenable number.

689659769 is a deficient number, since it is larger than the sum of its proper divisors (115591).

689659769 is a wasteful number, since it uses less digits than its factorization.

689659769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115590.

The product of its digits is 44089920, while the sum is 65.

The square root of 689659769 is about 26261.3740881927. The cubic root of 689659769 is about 883.5103282527.

The spelling of 689659769 in words is "six hundred eighty-nine million, six hundred fifty-nine thousand, seven hundred sixty-nine".