681105604 has 9 divisors (see below), whose sum is σ = 1192026157. Its totient is φ = 340526704.

The previous prime is 681105569. The next prime is 681105613. The reversal of 681105604 is 406501186.

The square root of 681105604 is 26098.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 388011204 + 293094400 = 19698^2 + 17120^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 45672 + ... + 58720.

Almost surely, 2^681105604 is an apocalyptic number.

681105604 is the 26098-th square number.

It is an amenable number.

681105604 is a deficient number, since it is larger than the sum of its proper divisors (510920553).

681105604 is an frugal number, since it uses more digits than its factorization.

681105604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26102 (or 13051 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The cubic root of 681105604 is about 879.8422599499.

The spelling of 681105604 in words is "six hundred eighty-one million, one hundred five thousand, six hundred four".