78523828 has 12 divisors (see below), whose sum is σ = 138834052. Its totient is φ = 38856960.

The previous prime is 78523811. The next prime is 78523829. The reversal of 78523828 is 82832587.

It can be written as a sum of positive squares in 2 ways, for example, as 55980324 + 22543504 = 7482^2 + 4748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78523829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100803 + ... + 101578.

Almost surely, 2^78523828 is an apocalyptic number.

It is an amenable number.

78523828 is a deficient number, since it is larger than the sum of its proper divisors (60310224).

78523828 is a wasteful number, since it uses less digits than its factorization.

78523828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202482 (or 202480 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 78523828 is about 8861.3671631414. The cubic root of 78523828 is about 428.2202043269.

The spelling of 78523828 in words is "seventy-eight million, five hundred twenty-three thousand, eight hundred twenty-eight".