681537572 has 12 divisors (see below), whose sum is σ = 1201272240. Its totient is φ = 338316936.

The previous prime is 681537569. The next prime is 681537589. The reversal of 681537572 is 275735186.

It is a happy number.

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, 612338 + ... + 613449.

It is an arithmetic number, because the mean of its divisors is an integer number (100106020).

Almost surely, 2^681537572 is an apocalyptic number.

It is an amenable number.

681537572 is a deficient number, since it is larger than the sum of its proper divisors (519734668).

681537572 is a wasteful number, since it uses less digits than its factorization.

681537572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225930 (or 1225928 counting only the distinct ones).

The product of its digits is 352800, while the sum is 44.

The square root of 681537572 is about 26106.2745714512. The cubic root of 681537572 is about 880.0282239570.

The spelling of 681537572 in words is "six hundred eighty-one million, five hundred thirty-seven thousand, five hundred seventy-two".