681568080 has 80 divisors (see below), whose sum is σ = 2237160384. Its totient is φ = 171059200.

The previous prime is 681568049. The next prime is 681568087. The reversal of 681568080 is 80865186.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681568087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79446 + ... + 87605.

Almost surely, 2^681568080 is an apocalyptic number.

681568080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681568080 is an abundant number, since it is smaller than the sum of its proper divisors (1555592304).

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

681568080 is a wasteful number, since it uses less digits than its factorization.

681568080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167084 (or 167078 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 681568080 is about 26106.8588688873. The cubic root of 681568080 is about 880.0413548058.

The spelling of 681568080 in words is "six hundred eighty-one million, five hundred sixty-eight thousand, eighty".