78840216 has 240 divisors, whose sum is σ = 278087040. Its totient is φ = 20684160.

The previous prime is 78840211. The next prime is 78840227. The reversal of 78840216 is 61204887.

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 (78840211) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 412681 + ... + 412871.

It is an arithmetic number, because the mean of its divisors is an integer number (1158696).

Almost surely, 2^78840216 is an apocalyptic number.

78840216 is the 5616-th heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78840216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139043520).

78840216 is an abundant number, since it is smaller than the sum of its proper divisors (199246824).

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

78840216 is a wasteful number, since it uses less digits than its factorization.

78840216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 78840216 is about 8879.2013154337. The cubic root of 78840216 is about 428.7945615214.

The spelling of 78840216 in words is "seventy-eight million, eight hundred forty thousand, two hundred sixteen".