78646285 has 4 divisors (see below), whose sum is σ = 94375548. Its totient is φ = 62917024.

The previous prime is 78646279. The next prime is 78646291. The reversal of 78646285 is 58264687.

78646285 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58264687 = 13 ⋅4481899.

It is an interprime number because it is at equal distance from previous prime (78646279) and next prime (78646291).

It can be written as a sum of positive squares in 2 ways, for example, as 37711881 + 40934404 = 6141^2 + 6398^2 .

It is a cyclic number.

It is not a de Polignac number, because 78646285 - 2³ = 78646277 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, 7864624 + ... + 7864633.

It is an arithmetic number, because the mean of its divisors is an integer number (23593887).

Almost surely, 2^78646285 is an apocalyptic number.

It is an amenable number.

78646285 is a deficient number, since it is larger than the sum of its proper divisors (15729263).

78646285 is a wasteful number, since it uses less digits than its factorization.

78646285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15729262.

The product of its digits is 645120, while the sum is 46.

The square root of 78646285 is about 8868.2740710918. The cubic root of 78646285 is about 428.4426901946.

The spelling of 78646285 in words is "seventy-eight million, six hundred forty-six thousand, two hundred eighty-five".