681143904 has 360 divisors, whose sum is σ = 2419357248. Its totient is φ = 187246080.

The previous prime is 681143891. The next prime is 681143929. The reversal of 681143904 is 409341186.

It is a super-2 number, since 2×681143904² = 927914035912722432, which contains 22 as substring.

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

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 59 ways as a sum of consecutive naturals, for example, 3937162 + ... + 3937334.

Almost surely, 2^681143904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681143904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1209678624).

681143904 is an abundant number, since it is smaller than the sum of its proper divisors (1738213344).

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

681143904 is a wasteful number, since it uses less digits than its factorization.

681143904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 681143904 is about 26098.7337623878. The cubic root of 681143904 is about 879.8587514341.

The spelling of 681143904 in words is "six hundred eighty-one million, one hundred forty-three thousand, nine hundred four".