28525251 has 8 divisors (see below), whose sum is σ = 40035520. Its totient is φ = 18015912.

The previous prime is 28525229. The next prime is 28525253. The reversal of 28525251 is 15252582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28525251 - 2⁵ = 28525219 is a prime.

It is a super-2 number, since 2×28525251² = 1627379889226002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28525253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250165 + ... + 250278.

It is an arithmetic number, because the mean of its divisors is an integer number (5004440).

Almost surely, 2^28525251 is an apocalyptic number.

28525251 is a deficient number, since it is larger than the sum of its proper divisors (11510269).

28525251 is a wasteful number, since it uses less digits than its factorization.

28525251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500465.

The product of its digits is 8000, while the sum is 30.

The square root of 28525251 is about 5340.9035752389. The cubic root of 28525251 is about 305.5459218463.

The spelling of 28525251 in words is "twenty-eight million, five hundred twenty-five thousand, two hundred fifty-one".