681879429 has 48 divisors (see below), whose sum is σ = 1292628480. Its totient is φ = 335573280.

The previous prime is 681879427. The next prime is 681879439. The reversal of 681879429 is 924978186.

It is not a de Polignac number, because 681879429 - 2¹ = 681879427 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681879427) 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 47 ways as a sum of consecutive naturals, for example, 12727 + ... + 39060.

It is an arithmetic number, because the mean of its divisors is an integer number (26929760).

Almost surely, 2^681879429 is an apocalyptic number.

It is an amenable number.

681879429 is a deficient number, since it is larger than the sum of its proper divisors (610749051).

681879429 is a wasteful number, since it uses less digits than its factorization.

681879429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51830 (or 51827 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 681879429 is about 26112.8211612610. The cubic root of 681879429 is about 880.1753391146.

The spelling of 681879429 in words is "six hundred eighty-one million, eight hundred seventy-nine thousand, four hundred twenty-nine".