28765247 has 4 divisors (see below), whose sum is σ = 32874576. Its totient is φ = 24655920.

The previous prime is 28765223. The next prime is 28765277. The reversal of 28765247 is 74256782.

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 28765247 - 2¹⁰ = 28764223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28765277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054654 + ... + 2054667.

It is an arithmetic number, because the mean of its divisors is an integer number (8218644).

Almost surely, 2^28765247 is an apocalyptic number.

28765247 is a deficient number, since it is larger than the sum of its proper divisors (4109329).

28765247 is an equidigital number, since it uses as much as digits as its factorization.

28765247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109328.

The product of its digits is 188160, while the sum is 41.

The square root of 28765247 is about 5363.3242490083. The cubic root of 28765247 is about 306.4004291102.

The spelling of 28765247 in words is "twenty-eight million, seven hundred sixty-five thousand, two hundred forty-seven".