78918417 has 12 divisors (see below), whose sum is σ = 115599744. Its totient is φ = 51870840.

The previous prime is 78918407. The next prime is 78918421. The reversal of 78918417 is 71481987.

It is not a de Polignac number, because 78918417 - 2⁴ = 78918401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78918407) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 61113 + ... + 62390.

It is an arithmetic number, because the mean of its divisors is an integer number (9633312).

Almost surely, 2^78918417 is an apocalyptic number.

It is an amenable number.

78918417 is a deficient number, since it is larger than the sum of its proper divisors (36681327).

78918417 is a wasteful number, since it uses less digits than its factorization.

78918417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123580 (or 123577 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 78918417 is about 8883.6038295277. The cubic root of 78918417 is about 428.9362873417.

The spelling of 78918417 in words is "seventy-eight million, nine hundred eighteen thousand, four hundred seventeen".