78255216 has 120 divisors (see below), whose sum is σ = 249827760. Its totient is φ = 22652928.

The previous prime is 78255173. The next prime is 78255217. The reversal of 78255216 is 61255287.

It is a happy number.

It is a super-2 number, since 2×78255216² = 12247757662413312, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78255217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30595 + ... + 33053.

It is an arithmetic number, because the mean of its divisors is an integer number (2081898).

Almost surely, 2^78255216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78255216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124913880).

78255216 is an abundant number, since it is smaller than the sum of its proper divisors (171572544).

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

78255216 is a wasteful number, since it uses less digits than its factorization.

78255216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503 (or 2494 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 78255216 is about 8846.1978273154. The cubic root of 78255216 is about 427.7313654762.

It can be divided in two parts, 7825 and 5216, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 78255216 in words is "seventy-eight million, two hundred fifty-five thousand, two hundred sixteen".