28864386 has 24 divisors (see below), whose sum is σ = 63162684. Its totient is φ = 9525600.

The previous prime is 28864361. The next prime is 28864421. The reversal of 28864386 is 68346882.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17514225 + 11350161 = 4185^2 + 3369^2 .

It is a super-3 number, since 3×28864386³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 6121 + ... + 9756.

Almost surely, 2^28864386 is an apocalyptic number.

28864386 is an abundant number, since it is smaller than the sum of its proper divisors (34298298).

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

28864386 is a wasteful number, since it uses less digits than its factorization.

28864386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15986 (or 15983 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 28864386 is about 5372.5586083355. The cubic root of 28864386 is about 306.7520270150.

It can be divided in two parts, 2886 and 4386, that multiplied together give a triangular number (12657996 = T₅₀₃₁).

The spelling of 28864386 in words is "twenty-eight million, eight hundred sixty-four thousand, three hundred eighty-six".