78215368 has 144 divisors (see below), whose sum is σ = 200593260. Its totient is φ = 28385280.

The previous prime is 78215353. The next prime is 78215369. The reversal of 78215368 is 86351287.

It can be written as a sum of positive squares in 2 ways, for example, as 77053284 + 1162084 = 8778^2 + 1078^2 .

It is a super-2 number, since 2×78215368² = 12235287582750848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78215368.

It is not an unprimeable number, because it can be changed into a prime (78215369) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 806296 + ... + 806392.

Almost surely, 2^78215368 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 78215368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100296630).

78215368 is an abundant number, since it is smaller than the sum of its proper divisors (122377892).

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

78215368 is a wasteful number, since it uses less digits than its factorization.

78215368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 134 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 78215368 is about 8843.9452734625. The cubic root of 78215368 is about 427.6587520703.

The spelling of 78215368 in words is "seventy-eight million, two hundred fifteen thousand, three hundred sixty-eight".