681486536 has 16 divisors (see below), whose sum is σ = 1295292300. Its totient is φ = 336075264.

The previous prime is 681486529. The next prime is 681486541. The reversal of 681486536 is 635684186.

It can be written as a sum of positive squares in 2 ways, for example, as 575520100 + 105966436 = 23990^2 + 10294^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582881 + ... + 584048.

Almost surely, 2^681486536 is an apocalyptic number.

It is an amenable number.

681486536 is a deficient number, since it is larger than the sum of its proper divisors (613805764).

681486536 is a wasteful number, since it uses less digits than its factorization.

681486536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167008 (or 1167004 counting only the distinct ones).

The product of its digits is 829440, while the sum is 47.

The square root of 681486536 is about 26105.2970869898. The cubic root of 681486536 is about 880.0062568426.

The spelling of 681486536 in words is "six hundred eighty-one million, four hundred eighty-six thousand, five hundred thirty-six".