79447881 has 8 divisors (see below), whose sum is σ = 106216000. Its totient is φ = 52822512.

The previous prime is 79447859. The next prime is 79447883. The reversal of 79447881 is 18874497.

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

It is not a de Polignac number, because 79447881 - 2⁹ = 79447369 is a prime.

It is a super-2 number, since 2×79447881² = 12623931590780322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79447881.

It is not an unprimeable number, because it can be changed into a prime (79447883) 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 7 ways as a sum of consecutive naturals, for example, 34381 + ... + 36618.

It is an arithmetic number, because the mean of its divisors is an integer number (13277000).

Almost surely, 2^79447881 is an apocalyptic number.

It is an amenable number.

79447881 is a deficient number, since it is larger than the sum of its proper divisors (26768119).

79447881 is a wasteful number, since it uses less digits than its factorization.

79447881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71375.

The product of its digits is 451584, while the sum is 48.

The square root of 79447881 is about 8913.3540824989. The cubic root of 79447881 is about 429.8933952423.

The spelling of 79447881 in words is "seventy-nine million, four hundred forty-seven thousand, eight hundred eighty-one".