681151744 has 108 divisors (see below), whose sum is σ = 1703696484. Its totient is φ = 269402112.

The previous prime is 681151711. The next prime is 681151771. The reversal of 681151744 is 447151186.

It can be written as a sum of positive squares in 2 ways, for example, as 379782144 + 301369600 = 19488^2 + 17360^2 .

It is a congruent number.

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, 160984 + ... + 165160.

Almost surely, 2^681151744 is an apocalyptic number.

681151744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681151744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851848242).

681151744 is an abundant number, since it is smaller than the sum of its proper divisors (1022544740).

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

681151744 is a wasteful number, since it uses less digits than its factorization.

681151744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4220 (or 4199 counting only the distinct ones).

The product of its digits is 26880, while the sum is 37.

The square root of 681151744 is about 26098.8839608133. The cubic root of 681151744 is about 879.8621271604.

The spelling of 681151744 in words is "six hundred eighty-one million, one hundred fifty-one thousand, seven hundred forty-four".