681471444 has 24 divisors (see below), whose sum is σ = 1604963808. Its totient is φ = 225033760.

The previous prime is 681471431. The next prime is 681471451. The reversal of 681471444 is 444174186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264087 + ... + 266654.

It is an arithmetic number, because the mean of its divisors is an integer number (66873492).

Almost surely, 2^681471444 is an apocalyptic number.

It is an amenable number.

681471444 is an abundant number, since it is smaller than the sum of its proper divisors (923492364).

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

681471444 is a wasteful number, since it uses less digits than its factorization.

681471444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530855 (or 530853 counting only the distinct ones).

The product of its digits is 86016, while the sum is 39.

The square root of 681471444 is about 26105.0080252813. The cubic root of 681471444 is about 879.9997606749. Note that the first 3 decimals are identical.

The spelling of 681471444 in words is "six hundred eighty-one million, four hundred seventy-one thousand, four hundred forty-four".