28536251 has 4 divisors (see below), whose sum is σ = 30214872. Its totient is φ = 26857632.

The previous prime is 28536241. The next prime is 28536269. The reversal of 28536251 is 15263582.

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 28536251 - 2⁶ = 28536187 is a prime.

It is a super-2 number, since 2×28536251² = 1628635242270002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28536241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839285 + ... + 839318.

It is an arithmetic number, because the mean of its divisors is an integer number (7553718).

Almost surely, 2^28536251 is an apocalyptic number.

28536251 is a deficient number, since it is larger than the sum of its proper divisors (1678621).

28536251 is a wasteful number, since it uses less digits than its factorization.

28536251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678620.

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

The square root of 28536251 is about 5341.9332642780. The cubic root of 28536251 is about 305.5851920027.

The spelling of 28536251 in words is "twenty-eight million, five hundred thirty-six thousand, two hundred fifty-one".