78527817 has 24 divisors (see below), whose sum is σ = 120931200. Its totient is φ = 48960288.

The previous prime is 78527807. The next prime is 78527843. The reversal of 78527817 is 71872587.

It is not a de Polignac number, because 78527817 - 2¹⁵ = 78495049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78527807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10603 + ... + 16415.

It is an arithmetic number, because the mean of its divisors is an integer number (5038800).

Almost surely, 2^78527817 is an apocalyptic number.

It is an amenable number.

78527817 is a deficient number, since it is larger than the sum of its proper divisors (42403383).

78527817 is a wasteful number, since it uses less digits than its factorization.

78527817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5917 (or 5914 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 78527817 is about 8861.5922384186. The cubic root of 78527817 is about 428.2274553805.

The spelling of 78527817 in words is "seventy-eight million, five hundred twenty-seven thousand, eight hundred seventeen".