28664019 has 12 divisors (see below), whose sum is σ = 41484456. Its totient is φ = 19072032.

The previous prime is 28663939. The next prime is 28664071. The reversal of 28664019 is 91046682.

28664019 is a `hidden beast` number, since 2 + 8 + 6 + 640 + 1 + 9 = 666.

It is not a de Polignac number, because 28664019 - 2⁷ = 28663891 is a prime.

It is a super-2 number, since 2×28664019² = 1643251970464722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28662019) 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 11 ways as a sum of consecutive naturals, for example, 2239 + ... + 7895.

It is an arithmetic number, because the mean of its divisors is an integer number (3457038).

Almost surely, 2^28664019 is an apocalyptic number.

28664019 is a deficient number, since it is larger than the sum of its proper divisors (12820437).

28664019 is a wasteful number, since it uses less digits than its factorization.

28664019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226 (or 6223 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28664019 is about 5353.8788742369. The cubic root of 28664019 is about 306.0405879777.

The spelling of 28664019 in words is "twenty-eight million, six hundred sixty-four thousand, nineteen".