78444044640 has 576 divisors, whose sum is σ = 294226732800. Its totient is φ = 18915950592.

The previous prime is 78444044617. The next prime is 78444044647. The reversal of 78444044640 is 4644044487.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78444044647) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 328217641 + ... + 328217879.

It is an arithmetic number, because the mean of its divisors is an integer number (510810300).

Almost surely, 2^78444044640 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 78444044640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147113366400).

78444044640 is an abundant number, since it is smaller than the sum of its proper divisors (215782688160).

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

78444044640 is a wasteful number, since it uses less digits than its factorization.

78444044640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 45.

The spelling of 78444044640 in words is "seventy-eight billion, four hundred forty-four million, forty-four thousand, six hundred forty".