681756030 has 48 divisors (see below), whose sum is σ = 1829752704. Its totient is φ = 175936320.

The previous prime is 681756011. The next prime is 681756079. The reversal of 681756030 is 30657186.

681756030 is a `hidden beast` number, since 68 + 1 + 7 + 560 + 30 = 666.

681756030 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119389 + ... + 124968.

It is an arithmetic number, because the mean of its divisors is an integer number (38119848).

Almost surely, 2^681756030 is an apocalyptic number.

681756030 is an abundant number, since it is smaller than the sum of its proper divisors (1147996674).

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

681756030 is a wasteful number, since it uses less digits than its factorization.

681756030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244401 (or 244398 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 681756030 is about 26110.4582495214. The cubic root of 681756030 is about 880.1222411109.

The spelling of 681756030 in words is "six hundred eighty-one million, seven hundred fifty-six thousand, thirty".