79720118 has 4 divisors (see below), whose sum is σ = 119580180. Its totient is φ = 39860058.

The previous prime is 79720117. The next prime is 79720211. The reversal of 79720118 is 81102797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81102797 = 41 ⋅1978117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79720117) 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 as a sum of consecutive naturals, namely, 19930028 + ... + 19930031.

It is an arithmetic number, because the mean of its divisors is an integer number (29895045).

Almost surely, 2^79720118 is an apocalyptic number.

79720118 is a deficient number, since it is larger than the sum of its proper divisors (39860062).

79720118 is a wasteful number, since it uses less digits than its factorization.

79720118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39860061.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 79720118 is about 8928.6123221921. The cubic root of 79720118 is about 430.3838612991.

The spelling of 79720118 in words is "seventy-nine million, seven hundred twenty thousand, one hundred eighteen".