778249 has 4 divisors (see below), whose sum is σ = 783364. Its totient is φ = 773136.

The previous prime is 778247. The next prime is 778301. The reversal of 778249 is 942877.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 455625 + 322624 = 675^2 + 568^2 .

It is a cyclic number.

It is not a de Polignac number, because 778249 - 2¹ = 778247 is a prime.

It is a Duffinian 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, 2322 + ... + 2635.

It is an arithmetic number, because the mean of its divisors is an integer number (195841).

2⁷⁷⁸²⁴⁹ is an apocalyptic number.

It is an amenable number.

778249 is a deficient number, since it is larger than the sum of its proper divisors (5115).

778249 is a wasteful number, since it uses less digits than its factorization.

778249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5114.

The product of its digits is 28224, while the sum is 37.

The square root of 778249 is about 882.1842211239. The cubic root of 778249 is about 91.9827078401.

The spelling of 778249 in words is "seven hundred seventy-eight thousand, two hundred forty-nine".