778441 has 4 divisors (see below), whose sum is σ = 803584. Its totient is φ = 753300.

The previous prime is 778439. The next prime is 778469. The reversal of 778441 is 144877.

778441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an emirpimes, since its reverse is a distinct semiprime: 144877 = 23 ⋅6299.

It is not a de Polignac number, because 778441 - 2¹ = 778439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 25111 = 778441 / (7 + 7 + 8 + 4 + 4 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12525 + ... + 12586.

It is an arithmetic number, because the mean of its divisors is an integer number (200896).

2⁷⁷⁸⁴⁴¹ is an apocalyptic number.

It is an amenable number.

778441 is a deficient number, since it is larger than the sum of its proper divisors (25143).

778441 is a wasteful number, since it uses less digits than its factorization.

778441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25142.

The product of its digits is 6272, while the sum is 31.

The square root of 778441 is about 882.2930352213. The cubic root of 778441 is about 91.9902714981.

The spelling of 778441 in words is "seven hundred seventy-eight thousand, four hundred forty-one".