681978146 has 16 divisors (see below), whose sum is σ = 1042683840. Its totient is φ = 334466160.

The previous prime is 681978119. The next prime is 681978149. The reversal of 681978146 is 641879186.

It is a junction number, because it is equal to n+sod(n) for n = 681978094 and 681978103.

It is not an unprimeable number, because it can be changed into a prime (681978149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15785 + ... + 40163.

It is an arithmetic number, because the mean of its divisors is an integer number (65167740).

Almost surely, 2^681978146 is an apocalyptic number.

681978146 is a deficient number, since it is larger than the sum of its proper divisors (360705694).

681978146 is a wasteful number, since it uses less digits than its factorization.

681978146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24649.

The product of its digits is 580608, while the sum is 50.

The square root of 681978146 is about 26114.7112945941. The cubic root of 681978146 is about 880.2178119588.

The spelling of 681978146 in words is "six hundred eighty-one million, nine hundred seventy-eight thousand, one hundred forty-six".