78312448 has 44 divisors (see below), whose sum is σ = 161663872. Its totient is φ = 37877760.

The previous prime is 78312431. The next prime is 78312449. The reversal of 78312448 is 84421387.

It is a super-2 number, since 2×78312448² = 12265679023505408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78312449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30511 + ... + 32977.

Almost surely, 2^78312448 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 78312448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80831936).

78312448 is an abundant number, since it is smaller than the sum of its proper divisors (83351424).

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

78312448 is a wasteful number, since it uses less digits than its factorization.

78312448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518 (or 2500 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 78312448 is about 8849.4320721728. The cubic root of 78312448 is about 427.8356139313.

It can be divided in two parts, 783 and 12448, that added together give a palindrome (13231).

The spelling of 78312448 in words is "seventy-eight million, three hundred twelve thousand, four hundred forty-eight".