689538864 has 40 divisors (see below), whose sum is σ = 2035782400. Its totient is φ = 197011008.

The previous prime is 689538847. The next prime is 689538881. The reversal of 689538864 is 468835986.

It is an interprime number because it is at equal distance from previous prime (689538847) and next prime (689538881).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025764 + ... + 1026435.

It is an arithmetic number, because the mean of its divisors is an integer number (50894560).

Almost surely, 2^689538864 is an apocalyptic number.

It is an amenable number.

689538864 is an abundant number, since it is smaller than the sum of its proper divisors (1346243536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689538864 is a wasteful number, since it uses less digits than its factorization.

689538864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052217 (or 2052211 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 57.

The square root of 689538864 is about 26259.0720323472. The cubic root of 689538864 is about 883.4586955182.

The spelling of 689538864 in words is "six hundred eighty-nine million, five hundred thirty-eight thousand, eight hundred sixty-four".