78444388 has 48 divisors (see below), whose sum is σ = 159344640. Its totient is φ = 33415200.

The previous prime is 78444371. The next prime is 78444389. The reversal of 78444388 is 88344487.

It is not an unprimeable number, because it can be changed into a prime (78444389) 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, 85653 + ... + 86563.

It is an arithmetic number, because the mean of its divisors is an integer number (3319680).

Almost surely, 2^78444388 is an apocalyptic number.

It is an amenable number.

78444388 is an abundant number, since it is smaller than the sum of its proper divisors (80900252).

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

78444388 is a wasteful number, since it uses less digits than its factorization.

78444388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048 (or 1046 counting only the distinct ones).

The product of its digits is 688128, while the sum is 46.

The square root of 78444388 is about 8856.8836505850. The cubic root of 78444388 is about 428.0757501235.

Subtracting 78444388 from its reverse (88344487), we obtain a palindrome (9900099).

The spelling of 78444388 in words is "seventy-eight million, four hundred forty-four thousand, three hundred eighty-eight".