689856544 has 24 divisors (see below), whose sum is σ = 1462629420. Its totient is φ = 318395136.

The previous prime is 689856539. The next prime is 689856569. The reversal of 689856544 is 445658986.

It can be written as a sum of positive squares in 2 ways, for example, as 519292944 + 170563600 = 22788^2 + 13060^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828739 + ... + 829570.

Almost surely, 2^689856544 is an apocalyptic number.

It is an amenable number.

689856544 is an abundant number, since it is smaller than the sum of its proper divisors (772772876).

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

689856544 is a wasteful number, since it uses less digits than its factorization.

689856544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658332 (or 1658324 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 55.

The square root of 689856544 is about 26265.1202928903. The cubic root of 689856544 is about 883.5943485289.

The spelling of 689856544 in words is "six hundred eighty-nine million, eight hundred fifty-six thousand, five hundred forty-four".