28532251 has 4 divisors (see below), whose sum is σ = 31126104. Its totient is φ = 25938400.
The previous prime is 28532237. The next prime is 28532261. The reversal of 28532251 is 15223582.
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 28532251 - 213 = 28524059 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (28532261) 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, 1296910 + ... + 1296931.
It is an arithmetic number, because the mean of its divisors is an integer number (7781526).
Almost surely, 228532251 is an apocalyptic number.
28532251 is a deficient number, since it is larger than the sum of its proper divisors (2593853).
28532251 is a wasteful number, since it uses less digits than its factorization.
28532251 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2593852.
The product of its digits is 4800, while the sum is 28.
The square root of 28532251 is about 5341.5588548662. The cubic root of 28532251 is about 305.5709131136.
The spelling of 28532251 in words is "twenty-eight million, five hundred thirty-two thousand, two hundred fifty-one".
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