681304572 has 108 divisors (see below), whose sum is σ = 1883254464. Its totient is φ = 207567360.

The previous prime is 681304571. The next prime is 681304607. The reversal of 681304572 is 275403186.

681304572 is a `hidden beast` number, since 6 + 81 + 3 + 0 + 4 + 572 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681304571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 686997 + ... + 687987.

Almost surely, 2^681304572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681304572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (941627232).

681304572 is an abundant number, since it is smaller than the sum of its proper divisors (1201949892).

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

681304572 is a wasteful number, since it uses less digits than its factorization.

681304572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140 (or 1122 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 681304572 is about 26101.8116612621. The cubic root of 681304572 is about 879.9279262597.

The spelling of 681304572 in words is "six hundred eighty-one million, three hundred four thousand, five hundred seventy-two".