78906165 has 32 divisors (see below), whose sum is σ = 136805760. Its totient is φ = 38605056.

The previous prime is 78906133. The next prime is 78906203. The reversal of 78906165 is 56160987.

It is not a de Polignac number, because 78906165 - 2⁵ = 78906133 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32566 + ... + 34904.

It is an arithmetic number, because the mean of its divisors is an integer number (4275180).

Almost surely, 2^78906165 is an apocalyptic number.

It is an amenable number.

78906165 is a deficient number, since it is larger than the sum of its proper divisors (57899595).

78906165 is a wasteful number, since it uses less digits than its factorization.

78906165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 78906165 is about 8882.9142177553. The cubic root of 78906165 is about 428.9140888926.

The spelling of 78906165 in words is "seventy-eight million, nine hundred six thousand, one hundred sixty-five".