78566823 has 6 divisors (see below), whose sum is σ = 113485424. Its totient is φ = 52377876.

The previous prime is 78566821. The next prime is 78566837. The reversal of 78566823 is 32866587.

78566823 is a `hidden beast` number, since 7 + 8 + 566 + 82 + 3 = 666.

It is not a de Polignac number, because 78566823 - 2¹ = 78566821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78566821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4364815 + ... + 4364832.

Almost surely, 2^78566823 is an apocalyptic number.

78566823 is a deficient number, since it is larger than the sum of its proper divisors (34918601).

78566823 is a wasteful number, since it uses less digits than its factorization.

78566823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8729653 (or 8729650 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 78566823 is about 8863.7928112067. The cubic root of 78566823 is about 428.2983460785.

The spelling of 78566823 in words is "seventy-eight million, five hundred sixty-six thousand, eight hundred twenty-three".