681144804 has 36 divisors (see below), whose sum is σ = 1722586320. Its totient is φ = 226942320.

The previous prime is 681144791. The next prime is 681144829. The reversal of 681144804 is 408441186.

681144804 is a `hidden beast` number, since 68 + 114 + 480 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129139 + ... + 134309.

It is an arithmetic number, because the mean of its divisors is an integer number (47849620).

Almost surely, 2^681144804 is an apocalyptic number.

It is an amenable number.

681144804 is an abundant number, since it is smaller than the sum of its proper divisors (1041441516).

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

681144804 is a wasteful number, since it uses less digits than its factorization.

681144804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8840 (or 8835 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 681144804 is about 26098.7510045979. The cubic root of 681144804 is about 879.8591389550.

It can be divided in two parts, 6811 and 44804, that added together give a palindrome (51615).

The spelling of 681144804 in words is "six hundred eighty-one million, one hundred forty-four thousand, eight hundred four".