28786864 has 10 divisors (see below), whose sum is σ = 55774580. Its totient is φ = 14393424.

The previous prime is 28786861. The next prime is 28786873. The reversal of 28786864 is 46868782.

It is not an unprimeable number, because it can be changed into a prime (28786861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899574 + ... + 899605.

It is an arithmetic number, because the mean of its divisors is an integer number (5577458).

Almost surely, 2^28786864 is an apocalyptic number.

It is an amenable number.

28786864 is a deficient number, since it is larger than the sum of its proper divisors (26987716).

28786864 is a wasteful number, since it uses less digits than its factorization.

28786864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799187 (or 1799181 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 49.

The square root of 28786864 is about 5365.3391318723. The cubic root of 28786864 is about 306.4771629040.

The spelling of 28786864 in words is "twenty-eight million, seven hundred eighty-six thousand, eight hundred sixty-four".