681190944 has 144 divisors (see below), whose sum is σ = 2094271200. Its totient is φ = 193299456.

The previous prime is 681190919. The next prime is 681190967. The reversal of 681190944 is 449091186.

It is a super-2 number, since 2×681190944² = 928042204375222272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 681190896 and 681190905.

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, 841612 + ... + 842420.

It is an arithmetic number, because the mean of its divisors is an integer number (14543550).

Almost surely, 2^681190944 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 681190944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1047135600).

681190944 is an abundant number, since it is smaller than the sum of its proper divisors (1413080256).

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

681190944 is a wasteful number, since it uses less digits than its factorization.

681190944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 681190944 is about 26099.6349399757. The cubic root of 681190944 is about 879.8790054033.

The spelling of 681190944 in words is "six hundred eighty-one million, one hundred ninety thousand, nine hundred forty-four".