81879146 has 16 divisors (see below), whose sum is σ = 124597440. Its totient is φ = 40351200.

The previous prime is 81879131. The next prime is 81879163. The reversal of 81879146 is 64197818.

It is a junction number, because it is equal to n+sod(n) for n = 81879097 and 81879106.

It is an unprimeable number.

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, 40385 + ... + 42363.

It is an arithmetic number, because the mean of its divisors is an integer number (7787340).

Almost surely, 2^81879146 is an apocalyptic number.

81879146 is a deficient number, since it is larger than the sum of its proper divisors (42718294).

81879146 is a wasteful number, since it uses less digits than its factorization.

81879146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269.

The product of its digits is 96768, while the sum is 44.

The square root of 81879146 is about 9048.7096317652. The cubic root of 81879146 is about 434.2346095035.

The spelling of 81879146 in words is "eighty-one million, eight hundred seventy-nine thousand, one hundred forty-six".