81926079 has 8 divisors (see below), whose sum is σ = 109310592. Its totient is φ = 54579480.

The previous prime is 81926057. The next prime is 81926083. The reversal of 81926079 is 97062918.

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

It is not a de Polignac number, because 81926079 - 2¹⁶ = 81860543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81926079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81926099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3979 + ... + 13404.

It is an arithmetic number, because the mean of its divisors is an integer number (13663824).

Almost surely, 2^81926079 is an apocalyptic number.

81926079 is a deficient number, since it is larger than the sum of its proper divisors (27384513).

81926079 is a wasteful number, since it uses less digits than its factorization.

81926079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18957.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 81926079 is about 9051.3026134364. The cubic root of 81926079 is about 434.3175611920.

The spelling of 81926079 in words is "eighty-one million, nine hundred twenty-six thousand, seventy-nine".