681343572 has 96 divisors (see below), whose sum is σ = 2059724800. Its totient is φ = 170232192.

The previous prime is 681343547. The next prime is 681343573. The reversal of 681343572 is 275343186.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 681343572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681343573) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4329 + ... + 37167.

Almost surely, 2^681343572 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 681343572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1029862400).

681343572 is an abundant number, since it is smaller than the sum of its proper divisors (1378381228).

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

681343572 is a wasteful number, since it uses less digits than its factorization.

681343572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32885 (or 32883 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The square root of 681343572 is about 26102.5587251518. The cubic root of 681343572 is about 879.9447158796.

The spelling of 681343572 in words is "six hundred eighty-one million, three hundred forty-three thousand, five hundred seventy-two".