78446441 has 2 divisors, whose sum is σ = 78446442. Its totient is φ = 78446440.

The previous prime is 78446429. The next prime is 78446477. The reversal of 78446441 is 14464487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71048041 + 7398400 = 8429^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 78446441 - 2⁶ = 78446377 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78446395 and 78446404.

It is not a weakly prime, because it can be changed into another prime (78445441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39223220 + 39223221.

It is an arithmetic number, because the mean of its divisors is an integer number (39223221).

Almost surely, 2^78446441 is an apocalyptic number.

It is an amenable number.

78446441 is a deficient number, since it is larger than the sum of its proper divisors (1).

78446441 is an equidigital number, since it uses as much as digits as its factorization.

78446441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 38.

The square root of 78446441 is about 8856.9995483798. Note that the first 3 decimals coincide. The cubic root of 78446441 is about 428.0794845391.

It can be divided in two parts, 78446 and 441, that added together give a palindrome (78887).

The spelling of 78446441 in words is "seventy-eight million, four hundred forty-six thousand, four hundred forty-one".