28556778 has 8 divisors (see below), whose sum is σ = 57113568. Its totient is φ = 9518924.

The previous prime is 28556747. The next prime is 28556779. The reversal of 28556778 is 87765582.

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

28556778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28556779) 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 3 ways as a sum of consecutive naturals, for example, 2379726 + ... + 2379737.

It is an arithmetic number, because the mean of its divisors is an integer number (7139196).

Almost surely, 2^28556778 is an apocalyptic number.

28556778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28556778 is a wasteful number, since it uses less digits than its factorization.

28556778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4759468.

The product of its digits is 940800, while the sum is 48.

The square root of 28556778 is about 5343.8542270537. The cubic root of 28556778 is about 305.6584467057.

The spelling of 28556778 in words is "twenty-eight million, five hundred fifty-six thousand, seven hundred seventy-eight".