28986251 has 4 divisors (see below), whose sum is σ = 33127152. Its totient is φ = 24845352.

The previous prime is 28986227. The next prime is 28986253. The reversal of 28986251 is 15268982.

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

It is not a de Polignac number, because 28986251 - 2¹⁴ = 28969867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28986199 and 28986208.

It is not an unprimeable number, because it can be changed into a prime (28986253) 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, 2070440 + ... + 2070453.

It is an arithmetic number, because the mean of its divisors is an integer number (8281788).

Almost surely, 2^28986251 is an apocalyptic number.

28986251 is a deficient number, since it is larger than the sum of its proper divisors (4140901).

28986251 is an equidigital number, since it uses as much as digits as its factorization.

28986251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140900.

The product of its digits is 69120, while the sum is 41.

The square root of 28986251 is about 5383.8880931906. Note that the first 3 decimals coincide. The cubic root of 28986251 is about 307.1831216934.

The spelling of 28986251 in words is "twenty-eight million, nine hundred eighty-six thousand, two hundred fifty-one".