28532247 has 4 divisors (see below), whose sum is σ = 38043000. Its totient is φ = 19021496.

The previous prime is 28532237. The next prime is 28532261. The reversal of 28532247 is 74223582.

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 28532247 - 2¹⁵ = 28499479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28532227) 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, 4755372 + ... + 4755377.

It is an arithmetic number, because the mean of its divisors is an integer number (9510750).

Almost surely, 2^28532247 is an apocalyptic number.

28532247 is a deficient number, since it is larger than the sum of its proper divisors (9510753).

28532247 is an equidigital number, since it uses as much as digits as its factorization.

28532247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9510752.

The product of its digits is 26880, while the sum is 33.

The square root of 28532247 is about 5341.5584804437. The cubic root of 28532247 is about 305.5708988341.

The spelling of 28532247 in words is "twenty-eight million, five hundred thirty-two thousand, two hundred forty-seven".