28525247 has 4 divisors (see below), whose sum is σ = 28992936. Its totient is φ = 28057560.

The previous prime is 28525229. The next prime is 28525253. The reversal of 28525247 is 74252582.

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

It is not a de Polignac number, because 28525247 - 2²⁴ = 11748031 is a prime.

It is a super-2 number, since 2×28525247² = 1627379432822018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28525547) 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, 233753 + ... + 233874.

It is an arithmetic number, because the mean of its divisors is an integer number (7248234).

Almost surely, 2^28525247 is an apocalyptic number.

28525247 is a deficient number, since it is larger than the sum of its proper divisors (467689).

28525247 is an equidigital number, since it uses as much as digits as its factorization.

28525247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467688.

The product of its digits is 44800, while the sum is 35.

The square root of 28525247 is about 5340.9032007704. The cubic root of 28525247 is about 305.5459075644.

The spelling of 28525247 in words is "twenty-eight million, five hundred twenty-five thousand, two hundred forty-seven".