28064493 has 12 divisors (see below), whose sum is σ = 40634880. Its totient is φ = 18664776.

The previous prime is 28064483. The next prime is 28064521. The reversal of 28064493 is 39446082.

It is a happy number.

28064493 is a `hidden beast` number, since 2 + 8 + 0 + 644 + 9 + 3 = 666.

It is not a de Polignac number, because 28064493 - 2⁵ = 28064461 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28064473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 468 + ... + 7506.

It is an arithmetic number, because the mean of its divisors is an integer number (3386240).

Almost surely, 2^28064493 is an apocalyptic number.

It is an amenable number.

28064493 is a deficient number, since it is larger than the sum of its proper divisors (12570387).

28064493 is a wasteful number, since it uses less digits than its factorization.

28064493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7488 (or 7485 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 28064493 is about 5297.5931327349. The cubic root of 28064493 is about 303.8918597647.

The spelling of 28064493 in words is "twenty-eight million, sixty-four thousand, four hundred ninety-three".