78804544 has 84 divisors (see below), whose sum is σ = 196003164. Its totient is φ = 31159296.

The previous prime is 78804527. The next prime is 78804547. The reversal of 78804544 is 44540887.

It can be written as a sum of positive squares in 2 ways, for example, as 31360000 + 47444544 = 5600^2 + 6888^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78804497 and 78804506.

It is not an unprimeable number, because it can be changed into a prime (78804547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39802 + ... + 41734.

It is an arithmetic number, because the mean of its divisors is an integer number (2333371).

Almost surely, 2^78804544 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 78804544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98001582).

78804544 is an abundant number, since it is smaller than the sum of its proper divisors (117198620).

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

78804544 is a wasteful number, since it uses less digits than its factorization.

78804544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972 (or 1955 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 40.

The square root of 78804544 is about 8877.1923489356. The cubic root of 78804544 is about 428.7298810496.

The spelling of 78804544 in words is "seventy-eight million, eight hundred four thousand, five hundred forty-four".