79218445 has 8 divisors (see below), whose sum is σ = 96042744. Its totient is φ = 62721024.

The previous prime is 79218439. The next prime is 79218479. The reversal of 79218445 is 54481297.

It can be written as a sum of positive squares in 4 ways, for example, as 29909961 + 49308484 = 5469^2 + 7022^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79218445 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79218398 and 79218407.

It is a congruent number.

It is an unprimeable number.

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, 81184 + ... + 82153.

It is an arithmetic number, because the mean of its divisors is an integer number (12005343).

Almost surely, 2^79218445 is an apocalyptic number.

It is an amenable number.

79218445 is a deficient number, since it is larger than the sum of its proper divisors (16824299).

79218445 is a wasteful number, since it uses less digits than its factorization.

79218445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163439.

The product of its digits is 80640, while the sum is 40.

The square root of 79218445 is about 8900.4744255573. The cubic root of 79218445 is about 429.4791692986.

The spelling of 79218445 in words is "seventy-nine million, two hundred eighteen thousand, four hundred forty-five".