78685827 has 8 divisors (see below), whose sum is σ = 114452160. Its totient is φ = 47688360.

The previous prime is 78685823. The next prime is 78685837. The reversal of 78685827 is 72858687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78685827 - 2² = 78685823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78685827.

It is not an unprimeable number, because it can be changed into a prime (78685823) 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 7 ways as a sum of consecutive naturals, for example, 1192177 + ... + 1192242.

It is an arithmetic number, because the mean of its divisors is an integer number (14306520).

Almost surely, 2^78685827 is an apocalyptic number.

78685827 is a deficient number, since it is larger than the sum of its proper divisors (35766333).

78685827 is a wasteful number, since it uses less digits than its factorization.

78685827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384433.

The product of its digits is 1505280, while the sum is 51.

The square root of 78685827 is about 8870.5031988045. The cubic root of 78685827 is about 428.5144827036.

It can be divided in two parts, 786858 and 27, that added together give a triangular number (786885 = T₁₂₅₄).

The spelling of 78685827 in words is "seventy-eight million, six hundred eighty-five thousand, eight hundred twenty-seven".