689917647 has 16 divisors (see below), whose sum is σ = 976292352. Its totient is φ = 431871360.

The previous prime is 689917633. The next prime is 689917661. The reversal of 689917647 is 746719986.

It is an interprime number because it is at equal distance from previous prime (689917633) and next prime (689917661).

It is not a de Polignac number, because 689917647 - 2⁸ = 689917391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689917667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6288 + ... + 37674.

It is an arithmetic number, because the mean of its divisors is an integer number (61018272).

Almost surely, 2^689917647 is an apocalyptic number.

689917647 is a deficient number, since it is larger than the sum of its proper divisors (286374705).

689917647 is a wasteful number, since it uses less digits than its factorization.

689917647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31838.

The product of its digits is 4572288, while the sum is 57.

The square root of 689917647 is about 26266.2834637868. The cubic root of 689917647 is about 883.6204354363.

The spelling of 689917647 in words is "six hundred eighty-nine million, nine hundred seventeen thousand, six hundred forty-seven".