78915165 has 32 divisors (see below), whose sum is σ = 145367040. Its totient is φ = 35809344.

The previous prime is 78915163. The next prime is 78915169. The reversal of 78915165 is 56151987.

It is not a de Polignac number, because 78915165 - 2¹ = 78915163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78915163) 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 31 ways as a sum of consecutive naturals, for example, 11892 + ... + 17298.

It is an arithmetic number, because the mean of its divisors is an integer number (4542720).

Almost surely, 2^78915165 is an apocalyptic number.

It is an amenable number.

78915165 is a deficient number, since it is larger than the sum of its proper divisors (66451875).

78915165 is a wasteful number, since it uses less digits than its factorization.

78915165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561.

The product of its digits is 75600, while the sum is 42.

The square root of 78915165 is about 8883.4207938159. The cubic root of 78915165 is about 428.9303955189.

The spelling of 78915165 in words is "seventy-eight million, nine hundred fifteen thousand, one hundred sixty-five".