28708253 has 4 divisors (see below), whose sum is σ = 32809440. Its totient is φ = 24607068.

The previous prime is 28708243. The next prime is 28708313. The reversal of 28708253 is 35280782.

It is a happy number.

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 28708253 - 2⁸ = 28707997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28708243) 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, 2050583 + ... + 2050596.

It is an arithmetic number, because the mean of its divisors is an integer number (8202360).

Almost surely, 2^28708253 is an apocalyptic number.

It is an amenable number.

28708253 is a deficient number, since it is larger than the sum of its proper divisors (4101187).

28708253 is an equidigital number, since it uses as much as digits as its factorization.

28708253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101186.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28708253 is about 5358.0083053314. The cubic root of 28708253 is about 306.1979332281.

The spelling of 28708253 in words is "twenty-eight million, seven hundred eight thousand, two hundred fifty-three".