681468880 has 40 divisors (see below), whose sum is σ = 1611280800. Its totient is φ = 267965568.

The previous prime is 681468857. The next prime is 681468929. The reversal of 681468880 is 88864186.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67470 + ... + 76909.

It is an arithmetic number, because the mean of its divisors is an integer number (40282020).

Almost surely, 2^681468880 is an apocalyptic number.

It is an amenable number.

681468880 is an abundant number, since it is smaller than the sum of its proper divisors (929811920).

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

681468880 is a wasteful number, since it uses less digits than its factorization.

681468880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144451 (or 144445 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 49.

The square root of 681468880 is about 26104.9589158842. The cubic root of 681468880 is about 879.9986570227.

The spelling of 681468880 in words is "six hundred eighty-one million, four hundred sixty-eight thousand, eight hundred eighty".