28122551 has 4 divisors (see below), whose sum is σ = 28134504. Its totient is φ = 28110600.

The previous prime is 28122533. The next prime is 28122571. The reversal of 28122551 is 15522182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28122551 - 2¹⁸ = 27860407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28122551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28122571) 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, 1145 + ... + 7586.

It is an arithmetic number, because the mean of its divisors is an integer number (7033626).

Almost surely, 2^28122551 is an apocalyptic number.

28122551 is a deficient number, since it is larger than the sum of its proper divisors (11953).

28122551 is an equidigital number, since it uses as much as digits as its factorization.

28122551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11952.

The product of its digits is 1600, while the sum is 26.

The square root of 28122551 is about 5303.0699599383. The cubic root of 28122551 is about 304.1012726705.

The spelling of 28122551 in words is "twenty-eight million, one hundred twenty-two thousand, five hundred fifty-one".