78459816 has 64 divisors (see below), whose sum is σ = 209390400. Its totient is φ = 24427008.

The previous prime is 78459767. The next prime is 78459827. The reversal of 78459816 is 61895487.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 32110 + ... + 34466.

It is an arithmetic number, because the mean of its divisors is an integer number (3271725).

Almost surely, 2^78459816 is an apocalyptic number.

78459816 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78459816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104695200).

78459816 is an abundant number, since it is smaller than the sum of its proper divisors (130930584).

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

78459816 is a wasteful number, since it uses less digits than its factorization.

78459816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458 (or 2454 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 78459816 is about 8857.7545687381. The cubic root of 78459816 is about 428.1038121256.

The spelling of 78459816 in words is "seventy-eight million, four hundred fifty-nine thousand, eight hundred sixteen".