681312444 has 24 divisors (see below), whose sum is σ = 1607593680. Its totient is φ = 224552064.

The previous prime is 681312427. The next prime is 681312461. The reversal of 681312444 is 444213186.

It is an interprime number because it is at equal distance from previous prime (681312427) and next prime (681312461).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317899 + ... + 320034.

It is an arithmetic number, because the mean of its divisors is an integer number (66983070).

Almost surely, 2^681312444 is an apocalyptic number.

It is an amenable number.

681312444 is an abundant number, since it is smaller than the sum of its proper divisors (926281236).

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

681312444 is a wasteful number, since it uses less digits than its factorization.

681312444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638029 (or 638027 counting only the distinct ones).

The product of its digits is 18432, while the sum is 33.

The square root of 681312444 is about 26101.9624549573. The cubic root of 681312444 is about 879.9313152315.

The spelling of 681312444 in words is "six hundred eighty-one million, three hundred twelve thousand, four hundred forty-four".