781056449 has 16 divisors (see below), whose sum is σ = 860343120. Its totient is φ = 705761280.

The previous prime is 781056431. The next prime is 781056457. The reversal of 781056449 is 944650187.

It can be written as a sum of positive squares in 8 ways, for example, as 692224 + 780364225 = 832^2 + 27935^2 .

It is a cyclic number.

It is not a de Polignac number, because 781056449 - 2⁸ = 781056193 is a prime.

It is a super-2 number, since 2×781056449² = 1220098353048979202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781056499) 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 15 ways as a sum of consecutive naturals, for example, 84857 + ... + 93609.

It is an arithmetic number, because the mean of its divisors is an integer number (53771445).

Almost surely, 2^781056449 is an apocalyptic number.

It is an amenable number.

781056449 is a deficient number, since it is larger than the sum of its proper divisors (79286671).

781056449 is a wasteful number, since it uses less digits than its factorization.

781056449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8980.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 781056449 is about 27947.3871587310. The cubic root of 781056449 is about 920.9318099269.

The spelling of 781056449 in words is "seven hundred eighty-one million, fifty-six thousand, four hundred forty-nine".