681884478 has 24 divisors (see below), whose sum is σ = 1611727416. Its totient is φ = 206631600.

The previous prime is 681884461. The next prime is 681884513. The reversal of 681884478 is 874488186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1721733 + ... + 1722128.

It is an arithmetic number, because the mean of its divisors is an integer number (67155309).

Almost surely, 2^681884478 is an apocalyptic number.

681884478 is an abundant number, since it is smaller than the sum of its proper divisors (929842938).

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

681884478 is a wasteful number, since it uses less digits than its factorization.

681884478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3443880 (or 3443877 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 54.

The square root of 681884478 is about 26112.9178377293. The cubic root of 681884478 is about 880.1775115389.

The spelling of 681884478 in words is "six hundred eighty-one million, eight hundred eighty-four thousand, four hundred seventy-eight".