681557312 has 28 divisors (see below), whose sum is σ = 1353715860. Its totient is φ = 340463616.

The previous prime is 681557297. The next prime is 681557339. The reversal of 681557312 is 213755186.

681557312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 337677376 + 343879936 = 18376^2 + 18544^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

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, 74864 + ... + 83472.

It is an arithmetic number, because the mean of its divisors is an integer number (48346995).

Almost surely, 2^681557312 is an apocalyptic number.

It is an amenable number.

681557312 is a deficient number, since it is larger than the sum of its proper divisors (672158548).

681557312 is a wasteful number, since it uses less digits than its factorization.

681557312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9858 (or 9848 counting only the distinct ones).

The product of its digits is 50400, while the sum is 38.

The square root of 681557312 is about 26106.6526387433. The cubic root of 681557312 is about 880.0367202308.

The spelling of 681557312 in words is "six hundred eighty-one million, five hundred fifty-seven thousand, three hundred twelve".