681738580 has 12 divisors (see below), whose sum is σ = 1431651060. Its totient is φ = 272695424.

The previous prime is 681738571. The next prime is 681738613. The reversal of 681738580 is 85837186.

It can be written as a sum of positive squares in 2 ways, for example, as 136702864 + 545035716 = 11692^2 + 23346^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 681738580.

It is a congruent number.

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, 17043445 + ... + 17043484.

It is an arithmetic number, because the mean of its divisors is an integer number (119304255).

Almost surely, 2^681738580 is an apocalyptic number.

It is an amenable number.

681738580 is an abundant number, since it is smaller than the sum of its proper divisors (749912480).

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

681738580 is a wasteful number, since it uses less digits than its factorization.

681738580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34086938 (or 34086936 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 681738580 is about 26110.1240900920. The cubic root of 681738580 is about 880.1147319417.

The spelling of 681738580 in words is "six hundred eighty-one million, seven hundred thirty-eight thousand, five hundred eighty".