28572233 has 4 divisors (see below), whose sum is σ = 29814528. Its totient is φ = 27329940.

The previous prime is 28572191. The next prime is 28572239. The reversal of 28572233 is 33227582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33227582 = 2 ⋅16613791.

It is a cyclic number.

It is not a de Polignac number, because 28572233 - 2¹⁸ = 28310089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28572233.

It is not an unprimeable number, because it can be changed into a prime (28572239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621113 + ... + 621158.

It is an arithmetic number, because the mean of its divisors is an integer number (7453632).

Almost surely, 2^28572233 is an apocalyptic number.

28572233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28572233 is a deficient number, since it is larger than the sum of its proper divisors (1242295).

28572233 is a wasteful number, since it uses less digits than its factorization.

28572233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242294.

The product of its digits is 20160, while the sum is 32.

The square root of 28572233 is about 5345.3000851215. The cubic root of 28572233 is about 305.7135778010.

The spelling of 28572233 in words is "twenty-eight million, five hundred seventy-two thousand, two hundred thirty-three".