78243312 has 80 divisors (see below), whose sum is σ = 232024832. Its totient is φ = 22256640.

The previous prime is 78243307. The next prime is 78243313. The reversal of 78243312 is 21334287.

It is a super-2 number, since 2×78243312² = 12244031745458688, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 78243312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78243313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112887 + ... + 113577.

Almost surely, 2^78243312 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 78243312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116012416).

78243312 is an abundant number, since it is smaller than the sum of its proper divisors (153781520).

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

78243312 is a wasteful number, since it uses less digits than its factorization.

78243312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 1040 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 78243312 is about 8845.5249702886. The cubic root of 78243312 is about 427.7096758788.

Adding to 78243312 its reverse (21334287), we get a palindrome (99577599).

The spelling of 78243312 in words is "seventy-eight million, two hundred forty-three thousand, three hundred twelve".