28553251 has 4 divisors (see below), whose sum is σ = 30232872. Its totient is φ = 26873632.

The previous prime is 28553249. The next prime is 28553309. The reversal of 28553251 is 15235582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28553251 - 2¹ = 28553249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28550251) 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, 839785 + ... + 839818.

It is an arithmetic number, because the mean of its divisors is an integer number (7558218).

Almost surely, 2^28553251 is an apocalyptic number.

28553251 is a deficient number, since it is larger than the sum of its proper divisors (1679621).

28553251 is a wasteful number, since it uses less digits than its factorization.

28553251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679620.

The product of its digits is 12000, while the sum is 31.

The square root of 28553251 is about 5343.5242116042. The cubic root of 28553251 is about 305.6458623993.

The spelling of 28553251 in words is "twenty-eight million, five hundred fifty-three thousand, two hundred fifty-one".