681251444 has 48 divisors (see below), whose sum is σ = 1279488000. Its totient is φ = 316663776.

The previous prime is 681251423. The next prime is 681251471. The reversal of 681251444 is 444152186.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 486257 + ... + 487655.

It is an arithmetic number, because the mean of its divisors is an integer number (26656000).

Almost surely, 2^681251444 is an apocalyptic number.

It is an amenable number.

681251444 is a deficient number, since it is larger than the sum of its proper divisors (598236556).

681251444 is a wasteful number, since it uses less digits than its factorization.

681251444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572 (or 1570 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 681251444 is about 26100.7939342848. The cubic root of 681251444 is about 879.9050534615.

The spelling of 681251444 in words is "six hundred eighty-one million, two hundred fifty-one thousand, four hundred forty-four".