681942504 has 128 divisors (see below), whose sum is σ = 1820206080. Its totient is φ = 212620800.

The previous prime is 681942493. The next prime is 681942577. The reversal of 681942504 is 405249186.

681942504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3004039 + ... + 3004265.

It is an arithmetic number, because the mean of its divisors is an integer number (14220360).

Almost surely, 2^681942504 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 681942504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910103040).

681942504 is an abundant number, since it is smaller than the sum of its proper divisors (1138263576).

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

681942504 is a wasteful number, since it uses less digits than its factorization.

681942504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 681942504 is about 26114.0288733853. The cubic root of 681942504 is about 880.2024775134.

The spelling of 681942504 in words is "six hundred eighty-one million, nine hundred forty-two thousand, five hundred four".