28071253 has 4 divisors (see below), whose sum is σ = 32081440. Its totient is φ = 24061068.

The previous prime is 28071209. The next prime is 28071257. The reversal of 28071253 is 35217082.

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: 35217082 = 2 ⋅17608541.

It is a cyclic number.

It is not a de Polignac number, because 28071253 - 2¹⁷ = 27940181 is a prime.

It is a super-3 number, since 3×28071253³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28071257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2005083 + ... + 2005096.

It is an arithmetic number, because the mean of its divisors is an integer number (8020360).

Almost surely, 2^28071253 is an apocalyptic number.

It is an amenable number.

28071253 is a deficient number, since it is larger than the sum of its proper divisors (4010187).

28071253 is an equidigital number, since it uses as much as digits as its factorization.

28071253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4010186.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 28071253 is about 5298.2311199116. The cubic root of 28071253 is about 303.9162576644.

The spelling of 28071253 in words is "twenty-eight million, seventy-one thousand, two hundred fifty-three".