681771884 has 6 divisors (see below), whose sum is σ = 1193100804. Its totient is φ = 340885940.

The previous prime is 681771847. The next prime is 681771901. The reversal of 681771884 is 488177186.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85221482 + ... + 85221489.

It is an arithmetic number, because the mean of its divisors is an integer number (198850134).

Almost surely, 2^681771884 is an apocalyptic number.

It is an amenable number.

681771884 is a deficient number, since it is larger than the sum of its proper divisors (511328920).

681771884 is a wasteful number, since it uses less digits than its factorization.

681771884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170442975 (or 170442973 counting only the distinct ones).

The product of its digits is 602112, while the sum is 50.

The square root of 681771884 is about 26110.7618425813. The cubic root of 681771884 is about 880.1290633705.

The spelling of 681771884 in words is "six hundred eighty-one million, seven hundred seventy-one thousand, eight hundred eighty-four".