78444677 has 2 divisors, whose sum is σ = 78444678. Its totient is φ = 78444676.

The previous prime is 78444671. The next prime is 78444721. The reversal of 78444677 is 77644487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78304801 + 139876 = 8849^2 + 374^2 .

It is a cyclic number.

It is not a de Polignac number, because 78444677 - 2⁴ = 78444661 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 (78444671) 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, 39222338 + 39222339.

It is an arithmetic number, because the mean of its divisors is an integer number (39222339).

Almost surely, 2^78444677 is an apocalyptic number.

It is an amenable number.

78444677 is a deficient number, since it is larger than the sum of its proper divisors (1).

78444677 is an equidigital number, since it uses as much as digits as its factorization.

78444677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1053696, while the sum is 47.

The square root of 78444677 is about 8856.8999655636. The cubic root of 78444677 is about 428.0762758197.

It can be divided in two parts, 7844 and 4677, that added together give a palindrome (12521).

The spelling of 78444677 in words is "seventy-eight million, four hundred forty-four thousand, six hundred seventy-seven".