56728778 has 8 divisors (see below), whose sum is σ = 86049540. Its totient is φ = 28045600.

The previous prime is 56728759. The next prime is 56728783. The reversal of 56728778 is 87782765.

56728778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 55547209 + 1181569 = 7453^2 + 1087^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 159173 + ... + 159528.

Almost surely, 2^56728778 is an apocalyptic number.

56728778 is a deficient number, since it is larger than the sum of its proper divisors (29320762).

56728778 is a wasteful number, since it uses less digits than its factorization.

56728778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318792.

The product of its digits is 1317120, while the sum is 50.

The square root of 56728778 is about 7531.8509013389. The cubic root of 56728778 is about 384.2387341068.

The spelling of 56728778 in words is "fifty-six million, seven hundred twenty-eight thousand, seven hundred seventy-eight".