681139782 has 48 divisors (see below), whose sum is σ = 1592136000. Its totient is φ = 209654016.

The previous prime is 681139769. The next prime is 681139793. The reversal of 681139782 is 287931186.

It is a congruent number.

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, 4782 + ... + 37217.

It is an arithmetic number, because the mean of its divisors is an integer number (33169500).

Almost surely, 2^681139782 is an apocalyptic number.

681139782 is an abundant number, since it is smaller than the sum of its proper divisors (910996218).

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

681139782 is a wasteful number, since it uses less digits than its factorization.

681139782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42077 (or 42074 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 681139782 is about 26098.6547929199. The cubic root of 681139782 is about 879.8569765840.

The spelling of 681139782 in words is "six hundred eighty-one million, one hundred thirty-nine thousand, seven hundred eighty-two".