78885567 has 6 divisors (see below), whose sum is σ = 113945832. Its totient is φ = 52590372.

The previous prime is 78885563. The next prime is 78885613. The reversal of 78885567 is 76558887.

It is a happy number.

78885567 is a `hidden beast` number, since 7 + 8 + 88 + 556 + 7 = 666.

It is not a de Polignac number, because 78885567 - 2² = 78885563 is a prime.

It is a super-2 number, since 2×78885567² = 12445865361822978, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78885563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4382523 + ... + 4382540.

It is an arithmetic number, because the mean of its divisors is an integer number (18990972).

Almost surely, 2^78885567 is an apocalyptic number.

78885567 is a deficient number, since it is larger than the sum of its proper divisors (35060265).

78885567 is a wasteful number, since it uses less digits than its factorization.

78885567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8765069 (or 8765066 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 54.

The square root of 78885567 is about 8881.7547252781. The cubic root of 78885567 is about 428.8767637936.

The spelling of 78885567 in words is "seventy-eight million, eight hundred eighty-five thousand, five hundred sixty-seven".