28644778 has 16 divisors (see below), whose sum is σ = 43838784. Its totient is φ = 14034240.

The previous prime is 28644769. The next prime is 28644797. The reversal of 28644778 is 87744682.

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 7 ways as a sum of consecutive naturals, for example, 31851 + ... + 32737.

It is an arithmetic number, because the mean of its divisors is an integer number (2739924).

Almost surely, 2^28644778 is an apocalyptic number.

28644778 is a deficient number, since it is larger than the sum of its proper divisors (15194006).

28644778 is a wasteful number, since it uses less digits than its factorization.

28644778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197.

The product of its digits is 602112, while the sum is 46.

The square root of 28644778 is about 5352.0816510961. The cubic root of 28644778 is about 305.9720950816.

The spelling of 28644778 in words is "twenty-eight million, six hundred forty-four thousand, seven hundred seventy-eight".