78745444 has 6 divisors (see below), whose sum is σ = 137804534. Its totient is φ = 39372720.

The previous prime is 78745441. The next prime is 78745451. The reversal of 78745444 is 44454787.

It can be written as a sum of positive squares in only one way, i.e., 42745444 + 36000000 = 6538^2 + 6000^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78745444.

It is not an unprimeable number, because it can be changed into a prime (78745441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9843177 + ... + 9843184.

Almost surely, 2^78745444 is an apocalyptic number.

It is an amenable number.

78745444 is a deficient number, since it is larger than the sum of its proper divisors (59059090).

78745444 is a wasteful number, since it uses less digits than its factorization.

78745444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19686365 (or 19686363 counting only the distinct ones).

The product of its digits is 501760, while the sum is 43.

The square root of 78745444 is about 8873.8629694175. The cubic root of 78745444 is about 428.6226779559.

The spelling of 78745444 in words is "seventy-eight million, seven hundred forty-five thousand, four hundred forty-four".