81679738 has 8 divisors (see below), whose sum is σ = 140022432. Its totient is φ = 35005596.

The previous prime is 81679711. The next prime is 81679751. The reversal of 81679738 is 83797618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81679691 and 81679700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2917120 + ... + 2917147.

It is an arithmetic number, because the mean of its divisors is an integer number (17502804).

Almost surely, 2^81679738 is an apocalyptic number.

81679738 is a deficient number, since it is larger than the sum of its proper divisors (58342694).

81679738 is a wasteful number, since it uses less digits than its factorization.

81679738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5834276.

The product of its digits is 508032, while the sum is 49.

The square root of 81679738 is about 9037.6843273042. The cubic root of 81679738 is about 433.8818121267.

The spelling of 81679738 in words is "eighty-one million, six hundred seventy-nine thousand, seven hundred thirty-eight".