681444006 has 32 divisors (see below), whose sum is σ = 1436812800. Its totient is φ = 214863840.

The previous prime is 681443969. The next prime is 681444007. The reversal of 681444006 is 600444186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681444007) 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, 76611 + ... + 85041.

It is an arithmetic number, because the mean of its divisors is an integer number (44900400).

Almost surely, 2^681444006 is an apocalyptic number.

681444006 is an abundant number, since it is smaller than the sum of its proper divisors (755368794).

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

681444006 is a wasteful number, since it uses less digits than its factorization.

681444006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9164.

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

The square root of 681444006 is about 26104.4824886455. The cubic root of 681444006 is about 879.9879500760.

The spelling of 681444006 in words is "six hundred eighty-one million, four hundred forty-four thousand, six".