28563251 has 4 divisors (see below), whose sum is σ = 30066600. Its totient is φ = 27059904.

The previous prime is 28563211. The next prime is 28563253. The reversal of 28563251 is 15236582.

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 28563251 - 2⁶ = 28563187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28563253) 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, 751646 + ... + 751683.

It is an arithmetic number, because the mean of its divisors is an integer number (7516650).

Almost surely, 2^28563251 is an apocalyptic number.

28563251 is a deficient number, since it is larger than the sum of its proper divisors (1503349).

28563251 is a wasteful number, since it uses less digits than its factorization.

28563251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503348.

The product of its digits is 14400, while the sum is 32.

The square root of 28563251 is about 5344.4598417427. The cubic root of 28563251 is about 305.6815396197.

It can be divided in two parts, 285 and 63251, that added together give a palindrome (63536).

The spelling of 28563251 in words is "twenty-eight million, five hundred sixty-three thousand, two hundred fifty-one".