681408888 has 64 divisors (see below), whose sum is σ = 1725094560. Its totient is φ = 224280576.

The previous prime is 681408887. The next prime is 681408899. The reversal of 681408888 is 888804186.

It is a self number, because there is not a number n which added to its sum of digits gives 681408888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681408881) 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, 726756 + ... + 727692.

Almost surely, 2^681408888 is an apocalyptic number.

It is an amenable number.

681408888 is an abundant number, since it is smaller than the sum of its proper divisors (1043685672).

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

681408888 is a wasteful number, since it uses less digits than its factorization.

681408888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296 (or 1292 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 51.

The square root of 681408888 is about 26103.8098368801. The cubic root of 681408888 is about 879.9728331834.

It can be divided in two parts, 68140 and 8888, that added together give a triangular number (77028 = T₃₉₂).

The spelling of 681408888 in words is "six hundred eighty-one million, four hundred eight thousand, eight hundred eighty-eight".