681012444 has 48 divisors (see below), whose sum is σ = 1817312000. Its totient is φ = 194438016.

The previous prime is 681012443. The next prime is 681012461. The reversal of 681012444 is 444210186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681012443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221832 + ... + 224880.

Almost surely, 2^681012444 is an apocalyptic number.

It is an amenable number.

681012444 is an abundant number, since it is smaller than the sum of its proper divisors (1136299556).

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

681012444 is a wasteful number, since it uses less digits than its factorization.

681012444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722 (or 5720 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 681012444 is about 26096.2151278686. The cubic root of 681012444 is about 879.8021438789.

The spelling of 681012444 in words is "six hundred eighty-one million, twelve thousand, four hundred forty-four".