681193152 has 84 divisors (see below), whose sum is σ = 2024878856. Its totient is φ = 227059200.

The previous prime is 681193141. The next prime is 681193157. The reversal of 681193152 is 251391186.

It is a super-2 number, since 2×681193152² = 928048220663390208, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (681193157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6349 + ... + 37452.

Almost surely, 2^681193152 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 681193152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1012439428).

681193152 is an abundant number, since it is smaller than the sum of its proper divisors (1343685704).

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

681193152 is an equidigital number, since it uses as much as digits as its factorization.

681193152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43828 (or 43806 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 681193152 is about 26099.6772393836. The cubic root of 681193152 is about 879.8799560769.

The spelling of 681193152 in words is "six hundred eighty-one million, one hundred ninety-three thousand, one hundred fifty-two".