681854679 has 40 divisors (see below), whose sum is σ = 1113742080. Its totient is φ = 412290000.

The previous prime is 681854669. The next prime is 681854687. The reversal of 681854679 is 976458186.

It is not a de Polignac number, because 681854679 - 2¹⁵ = 681821911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681854639) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 668632 + ... + 669650.

It is an arithmetic number, because the mean of its divisors is an integer number (27843552).

Almost surely, 2^681854679 is an apocalyptic number.

681854679 is a deficient number, since it is larger than the sum of its proper divisors (431887401).

681854679 is a wasteful number, since it uses less digits than its factorization.

681854679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793 (or 1784 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 681854679 is about 26112.3472518271. The cubic root of 681854679 is about 880.1646898207.

The spelling of 681854679 in words is "six hundred eighty-one million, eight hundred fifty-four thousand, six hundred seventy-nine".