681255678 has 32 divisors (see below), whose sum is σ = 1438416000. Its totient is φ = 214504416.

The previous prime is 681255661. The next prime is 681255683. The reversal of 681255678 is 876552186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31225 + ... + 48347.

It is an arithmetic number, because the mean of its divisors is an integer number (44950500).

Almost surely, 2^681255678 is an apocalyptic number.

681255678 is an abundant number, since it is smaller than the sum of its proper divisors (757160322).

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

681255678 is a wasteful number, since it uses less digits than its factorization.

681255678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17496.

The product of its digits is 806400, while the sum is 48.

The square root of 681255678 is about 26100.8750428027. The cubic root of 681255678 is about 879.9068763372.

The spelling of 681255678 in words is "six hundred eighty-one million, two hundred fifty-five thousand, six hundred seventy-eight".