78985165 has 16 divisors (see below), whose sum is σ = 108726912. Its totient is φ = 53959104.

The previous prime is 78985141. The next prime is 78985169. The reversal of 78985165 is 56158987.

It is a cyclic number.

It is not a de Polignac number, because 78985165 - 2⁵ = 78985133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78985169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5622 + ... + 13768.

It is an arithmetic number, because the mean of its divisors is an integer number (6795432).

Almost surely, 2^78985165 is an apocalyptic number.

It is an amenable number.

78985165 is a deficient number, since it is larger than the sum of its proper divisors (29741747).

78985165 is a wasteful number, since it uses less digits than its factorization.

78985165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8436.

The product of its digits is 604800, while the sum is 49.

The square root of 78985165 is about 8887.3598441832. The cubic root of 78985165 is about 429.0571825327.

The spelling of 78985165 in words is "seventy-eight million, nine hundred eighty-five thousand, one hundred sixty-five".