28215253 has 4 divisors (see below), whose sum is σ = 30780288. Its totient is φ = 25650220.

The previous prime is 28215221. The next prime is 28215277. The reversal of 28215253 is 35251282.

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.

It is a cyclic number.

It is not a de Polignac number, because 28215253 - 2⁵ = 28215221 is a prime.

It is a super-2 number, since 2×28215253² = 1592201003708018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28215203) 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, 1282501 + ... + 1282522.

It is an arithmetic number, because the mean of its divisors is an integer number (7695072).

Almost surely, 2^28215253 is an apocalyptic number.

It is an amenable number.

28215253 is a deficient number, since it is larger than the sum of its proper divisors (2565035).

28215253 is a wasteful number, since it uses less digits than its factorization.

28215253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565034.

The product of its digits is 4800, while the sum is 28.

The square root of 28215253 is about 5311.8031778295. The cubic root of 28215253 is about 304.4350484261.

The spelling of 28215253 in words is "twenty-eight million, two hundred fifteen thousand, two hundred fifty-three".