681864126 has 16 divisors (see below), whose sum is σ = 1364160000. Its totient is φ = 227216088.

The previous prime is 681864097. The next prime is 681864151. The reversal of 681864126 is 621468186.

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, 4755 + ... + 37233.

It is an arithmetic number, because the mean of its divisors is an integer number (85260000).

Almost surely, 2^681864126 is an apocalyptic number.

681864126 is an abundant number, since it is smaller than the sum of its proper divisors (682295874).

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

681864126 is a wasteful number, since it uses less digits than its factorization.

681864126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35983.

The product of its digits is 110592, while the sum is 42.

The square root of 681864126 is about 26112.5281426368. The cubic root of 681864126 is about 880.1687546543.

The spelling of 681864126 in words is "six hundred eighty-one million, eight hundred sixty-four thousand, one hundred twenty-six".