28561864 has 16 divisors (see below), whose sum is σ = 56372400. Its totient is φ = 13529232.

The previous prime is 28561829. The next prime is 28561867. The reversal of 28561864 is 46816582.

It is not an unprimeable number, because it can be changed into a prime (28561867) by changing a digit.

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, 93802 + ... + 94105.

It is an arithmetic number, because the mean of its divisors is an integer number (3523275).

Almost surely, 2^28561864 is an apocalyptic number.

It is an amenable number.

28561864 is a deficient number, since it is larger than the sum of its proper divisors (27810536).

28561864 is a wasteful number, since it uses less digits than its factorization.

28561864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187932 (or 187928 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 28561864 is about 5344.3300796264. The cubic root of 28561864 is about 305.6765916866.

The spelling of 28561864 in words is "twenty-eight million, five hundred sixty-one thousand, eight hundred sixty-four".