681291858 has 16 divisors (see below), whose sum is σ = 1467398016. Its totient is φ = 209628240.

The previous prime is 681291857. The next prime is 681291869. The reversal of 681291858 is 858192186.

It is not an unprimeable number, because it can be changed into a prime (681291857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4367178 + ... + 4367333.

It is an arithmetic number, because the mean of its divisors is an integer number (91712376).

Almost surely, 2^681291858 is an apocalyptic number.

681291858 is an abundant number, since it is smaller than the sum of its proper divisors (786106158).

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

681291858 is a wasteful number, since it uses less digits than its factorization.

681291858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8734529.

The product of its digits is 276480, while the sum is 48.

The square root of 681291858 is about 26101.5681138126. The cubic root of 681291858 is about 879.9224527052.

The spelling of 681291858 in words is "six hundred eighty-one million, two hundred ninety-one thousand, eight hundred fifty-eight".