78684085 has 4 divisors (see below), whose sum is σ = 94420908. Its totient is φ = 62947264.

The previous prime is 78684071. The next prime is 78684097. The reversal of 78684085 is 58048687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51236964 + 27447121 = 7158^2 + 5239^2 .

It is a cyclic number.

It is not a de Polignac number, because 78684085 - 2¹⁹ = 78159797 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, 7868404 + ... + 7868413.

It is an arithmetic number, because the mean of its divisors is an integer number (23605227).

Almost surely, 2^78684085 is an apocalyptic number.

It is an amenable number.

78684085 is a deficient number, since it is larger than the sum of its proper divisors (15736823).

78684085 is a wasteful number, since it uses less digits than its factorization.

78684085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15736822.

The product of its (nonzero) digits is 430080, while the sum is 46.

The square root of 78684085 is about 8870.4050076645. The cubic root of 78684085 is about 428.5113204325.

The spelling of 78684085 in words is "seventy-eight million, six hundred eighty-four thousand, eighty-five".