78216336 has 135 divisors (see below), whose sum is σ = 244250643. Its totient is φ = 23348160.

The previous prime is 78216283. The next prime is 78216343. The reversal of 78216336 is 63361287.

It is a happy number.

The square root of 78216336 is 8844.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×78216336² = 12235590434529792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 78216336.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1167375 + ... + 1167441.

Almost surely, 2^78216336 is an apocalyptic number.

78216336 is the 8844-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78216336

78216336 is an abundant number, since it is smaller than the sum of its proper divisors (166034307).

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

78216336 is a wasteful number, since it uses less digits than its factorization.

78216336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 83 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The cubic root of 78216336 is about 427.6605163100.

Multiplying 78216336 by its sum of digits (36), we get a square (2815788096 = 53064²).

78216336 divided by its sum of digits (36) gives a square (2172676 = 1474²).

The spelling of 78216336 in words is "seventy-eight million, two hundred sixteen thousand, three hundred thirty-six".