681765760 has 64 divisors (see below), whose sum is σ = 1755240480. Its totient is φ = 251725824.

The previous prime is 681765751. The next prime is 681765767. The reversal of 681765760 is 67567186.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 681765760.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681765767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32652 + ... + 49291.

Almost surely, 2^681765760 is an apocalyptic number.

It is an amenable number.

681765760 is an abundant number, since it is smaller than the sum of its proper divisors (1073474720).

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

681765760 is a wasteful number, since it uses less digits than its factorization.

681765760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81975 (or 81963 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 681765760 is about 26110.6445726642. The cubic root of 681765760 is about 880.1264281164.

The spelling of 681765760 in words is "six hundred eighty-one million, seven hundred sixty-five thousand, seven hundred sixty".