689404639 has 24 divisors (see below), whose sum is σ = 877076480. Its totient is φ = 530346960.

The previous prime is 689404637. The next prime is 689404663. The reversal of 689404639 is 936404986.

It is not a de Polignac number, because 689404639 - 2¹ = 689404637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689404592 and 689404601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689404631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61762 + ... + 72064.

Almost surely, 2^689404639 is an apocalyptic number.

689404639 is a deficient number, since it is larger than the sum of its proper divisors (187671841).

689404639 is a wasteful number, since it uses less digits than its factorization.

689404639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10411 (or 10400 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 689404639 is about 26256.5161245737. The cubic root of 689404639 is about 883.4013673797.

The spelling of 689404639 in words is "six hundred eighty-nine million, four hundred four thousand, six hundred thirty-nine".