778126441 has 4 divisors (see below), whose sum is σ = 778192272. Its totient is φ = 778060612.

The previous prime is 778126369. The next prime is 778126471. The reversal of 778126441 is 144621877.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 144621877 = 547 ⋅264391.

It is a cyclic number.

It is not a de Polignac number, because 778126441 - 2¹³ = 778118249 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 778126394 and 778126403.

It is not an unprimeable number, because it can be changed into a prime (778126471) 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 in 3 ways as a sum of consecutive naturals, for example, 9751 + ... + 40636.

It is an arithmetic number, because the mean of its divisors is an integer number (194548068).

Almost surely, 2^778126441 is an apocalyptic number.

It is an amenable number.

778126441 is a deficient number, since it is larger than the sum of its proper divisors (65831).

778126441 is a wasteful number, since it uses less digits than its factorization.

778126441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65830.

The product of its digits is 75264, while the sum is 40.

The square root of 778126441 is about 27894.9178346164. The cubic root of 778126441 is about 919.7787909399.

The spelling of 778126441 in words is "seven hundred seventy-eight million, one hundred twenty-six thousand, four hundred forty-one".