78288816 has 40 divisors (see below), whose sum is σ = 212893120. Its totient is φ = 24722496.

The previous prime is 78288809. The next prime is 78288829. The reversal of 78288816 is 61888287.

It is a super-2 number, since 2×78288816² = 12258277421363712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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 7 ways as a sum of consecutive naturals, for example, 42010 + ... + 43833.

It is an arithmetic number, because the mean of its divisors is an integer number (5322328).

Almost surely, 2^78288816 is an apocalyptic number.

78288816 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

78288816 is an abundant number, since it is smaller than the sum of its proper divisors (134604304).

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

78288816 is a wasteful number, since it uses less digits than its factorization.

78288816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85873 (or 85867 counting only the distinct ones).

The product of its digits is 344064, while the sum is 48.

The square root of 78288816 is about 8848.0967444982. The cubic root of 78288816 is about 427.7925742500.

It can be divided in two parts, 782 and 88816, that added together give a palindrome (89598).

The spelling of 78288816 in words is "seventy-eight million, two hundred eighty-eight thousand, eight hundred sixteen".