78916885 has 4 divisors (see below), whose sum is σ = 94700268. Its totient is φ = 63133504.

The previous prime is 78916879. The next prime is 78916921. The reversal of 78916885 is 58861987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58861987 = 2351 ⋅25037.

It can be written as a sum of positive squares in 2 ways, for example, as 15539364 + 63377521 = 3942^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 78916885 - 2⁵ = 78916853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7891684 + ... + 7891693.

It is an arithmetic number, because the mean of its divisors is an integer number (23675067).

Almost surely, 2^78916885 is an apocalyptic number.

It is an amenable number.

78916885 is a deficient number, since it is larger than the sum of its proper divisors (15783383).

78916885 is a wasteful number, since it uses less digits than its factorization.

78916885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15783382.

The product of its digits is 967680, while the sum is 52.

The square root of 78916885 is about 8883.5176028418. The cubic root of 78916885 is about 428.9335117553.

The spelling of 78916885 in words is "seventy-eight million, nine hundred sixteen thousand, eight hundred eighty-five".