78313312 has 96 divisors (see below), whose sum is σ = 197648640. Its totient is φ = 29652480.

The previous prime is 78313303. The next prime is 78313331. The reversal of 78313312 is 21331387.

It is a super-2 number, since 2×78313312² = 12265949672818688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90739 + ... + 91597.

It is an arithmetic number, because the mean of its divisors is an integer number (2058840).

Almost surely, 2^78313312 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 78313312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98824320).

78313312 is an abundant number, since it is smaller than the sum of its proper divisors (119335328).

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

78313312 is a wasteful number, since it uses less digits than its factorization.

78313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924 (or 916 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

The square root of 78313312 is about 8849.4808887301. The cubic root of 78313312 is about 427.8371873236.

Adding to 78313312 its reverse (21331387), we get a palindrome (99644699).

The spelling of 78313312 in words is "seventy-eight million, three hundred thirteen thousand, three hundred twelve".