681279732 has 108 divisors (see below), whose sum is σ = 2108826720. Its totient is φ = 184397472.

The previous prime is 681279721. The next prime is 681279737. The reversal of 681279732 is 237972186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681279737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23353 + ... + 43679.

Almost surely, 2^681279732 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 681279732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054413360).

681279732 is an abundant number, since it is smaller than the sum of its proper divisors (1427546988).

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

681279732 is a wasteful number, since it uses less digits than its factorization.

681279732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20370 (or 20358 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 681279732 is about 26101.3358278844. The cubic root of 681279732 is about 879.9172322294.

The spelling of 681279732 in words is "six hundred eighty-one million, two hundred seventy-nine thousand, seven hundred thirty-two".