689877631 has 4 divisors (see below), whose sum is σ = 726187000. Its totient is φ = 653568264.

The previous prime is 689877613. The next prime is 689877637. The reversal of 689877631 is 136778986.

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 689877631 - 2¹¹ = 689875583 is a prime.

It is a super-2 number, since 2×689877631² = 951862291508344322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689877637) 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, 18154656 + ... + 18154693.

It is an arithmetic number, because the mean of its divisors is an integer number (181546750).

Almost surely, 2^689877631 is an apocalyptic number.

689877631 is a deficient number, since it is larger than the sum of its proper divisors (36309369).

689877631 is a wasteful number, since it uses less digits than its factorization.

689877631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36309368.

The product of its digits is 3048192, while the sum is 55.

The square root of 689877631 is about 26265.5217157398. The cubic root of 689877631 is about 883.6033514461.

The spelling of 689877631 in words is "six hundred eighty-nine million, eight hundred seventy-seven thousand, six hundred thirty-one".