681043140 has 60 divisors (see below), whose sum is σ = 2136462636. Its totient is φ = 181611072.

The previous prime is 681043093. The next prime is 681043151. The reversal of 681043140 is 41340186.

It can be written as a sum of positive squares in 2 ways, for example, as 110502144 + 570540996 = 10512^2 + 23886^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 208579 + ... + 211818.

Almost surely, 2^681043140 is an apocalyptic number.

681043140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681043140 is an abundant number, since it is smaller than the sum of its proper divisors (1455419496).

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

681043140 is a wasteful number, since it uses less digits than its factorization.

681043140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420418 (or 420407 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 681043140 is about 26096.8032525059. The cubic root of 681043140 is about 879.8153624337.

The spelling of 681043140 in words is "six hundred eighty-one million, forty-three thousand, one hundred forty".