79378169 has 8 divisors (see below), whose sum is σ = 85563912. Its totient is φ = 73203840.

The previous prime is 79378127. The next prime is 79378177. The reversal of 79378169 is 96187397.

It can be written as a sum of positive squares in 4 ways, for example, as 31214569 + 48163600 = 5587^2 + 6940^2 .

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-79378169 is a prime.

It is a super-2 number, since 2×79378169² = 12601787427585122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79378199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16499 + ... + 20759.

It is an arithmetic number, because the mean of its divisors is an integer number (10695489).

Almost surely, 2^79378169 is an apocalyptic number.

It is an amenable number.

79378169 is a deficient number, since it is larger than the sum of its proper divisors (6185743).

79378169 is a wasteful number, since it uses less digits than its factorization.

79378169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5707.

The product of its digits is 571536, while the sum is 50.

The square root of 79378169 is about 8909.4426873963. The cubic root of 79378169 is about 429.7676209709.

The spelling of 79378169 in words is "seventy-nine million, three hundred seventy-eight thousand, one hundred sixty-nine".