78810828 has 24 divisors (see below), whose sum is σ = 184289280. Its totient is φ = 26213520.

The previous prime is 78810799. The next prime is 78810829. The reversal of 78810828 is 82801887.

It is a happy number.

It is a super-2 number, since 2×78810828² = 12422293220091168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78810828.

It is not an unprimeable number, because it can be changed into a prime (78810829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1108 + ... + 12603.

It is an arithmetic number, because the mean of its divisors is an integer number (7678720).

Almost surely, 2^78810828 is an apocalyptic number.

It is an amenable number.

78810828 is an abundant number, since it is smaller than the sum of its proper divisors (105478452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78810828 is a wasteful number, since it uses less digits than its factorization.

78810828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14197 (or 14195 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 78810828 is about 8877.5462826166. The cubic root of 78810828 is about 428.7412766148.

The spelling of 78810828 in words is "seventy-eight million, eight hundred ten thousand, eight hundred twenty-eight".