78844901 has 2 divisors, whose sum is σ = 78844902. Its totient is φ = 78844900.

The previous prime is 78844859. The next prime is 78844921. The reversal of 78844901 is 10944887.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70728100 + 8116801 = 8410^2 + 2849^2 .

It is an emirp because it is prime and its reverse (10944887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78844901 - 2¹⁴ = 78828517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78844921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39422450 + 39422451.

It is an arithmetic number, because the mean of its divisors is an integer number (39422451).

Almost surely, 2^78844901 is an apocalyptic number.

It is an amenable number.

78844901 is a deficient number, since it is larger than the sum of its proper divisors (1).

78844901 is an equidigital number, since it uses as much as digits as its factorization.

78844901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 78844901 is about 8879.4651302880. The cubic root of 78844901 is about 428.8030549140.

The spelling of 78844901 in words is "seventy-eight million, eight hundred forty-four thousand, nine hundred one".