78326165 has 4 divisors (see below), whose sum is σ = 93991404. Its totient is φ = 62660928.

The previous prime is 78326159. The next prime is 78326179. The reversal of 78326165 is 56162387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19864849 + 58461316 = 4457^2 + 7646^2 .

It is a cyclic number.

It is not a de Polignac number, because 78326165 - 2⁸ = 78325909 is a prime.

It is a super-2 number, since 2×78326165² = 12269976247214450, which contains 22 as substring.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 7832612 + ... + 7832621.

It is an arithmetic number, because the mean of its divisors is an integer number (23497851).

Almost surely, 2^78326165 is an apocalyptic number.

It is an amenable number.

78326165 is a deficient number, since it is larger than the sum of its proper divisors (15665239).

78326165 is a wasteful number, since it uses less digits than its factorization.

78326165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15665238.

The product of its digits is 60480, while the sum is 38.

The square root of 78326165 is about 8850.2070597246. The cubic root of 78326165 is about 427.8605919889.

The spelling of 78326165 in words is "seventy-eight million, three hundred twenty-six thousand, one hundred sixty-five".