780778449 has 24 divisors (see below), whose sum is σ = 1231401600. Its totient is φ = 472782240.

The previous prime is 780778423. The next prime is 780778459. The reversal of 780778449 is 944877087.

It is not a de Polignac number, because 780778449 - 2⁹ = 780777937 is a prime.

It is a super-2 number, since 2×780778449² = 1219229972845691202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 780778395 and 780778404.

It is not an unprimeable number, because it can be changed into a prime (780778459) 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 in 23 ways as a sum of consecutive naturals, for example, 138712 + ... + 144230.

It is an arithmetic number, because the mean of its divisors is an integer number (51308400).

Almost surely, 2^780778449 is an apocalyptic number.

It is an amenable number.

780778449 is a deficient number, since it is larger than the sum of its proper divisors (450623151).

780778449 is a wasteful number, since it uses less digits than its factorization.

780778449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6965 (or 6962 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The square root of 780778449 is about 27942.4130847713. The cubic root of 780778449 is about 920.8225351004.

The spelling of 780778449 in words is "seven hundred eighty million, seven hundred seventy-eight thousand, four hundred forty-nine".