28533566 has 4 divisors (see below), whose sum is σ = 42800352. Its totient is φ = 14266782.

The previous prime is 28533509. The next prime is 28533569. The reversal of 28533566 is 66533582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66533582 = 2 ⋅33266791.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28533569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7133390 + ... + 7133393.

It is an arithmetic number, because the mean of its divisors is an integer number (10700088).

Almost surely, 2^28533566 is an apocalyptic number.

28533566 is a deficient number, since it is larger than the sum of its proper divisors (14266786).

28533566 is a wasteful number, since it uses less digits than its factorization.

28533566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14266785.

The product of its digits is 129600, while the sum is 38.

The square root of 28533566 is about 5341.6819448559. The cubic root of 28533566 is about 305.5756074456.

The spelling of 28533566 in words is "twenty-eight million, five hundred thirty-three thousand, five hundred sixty-six".