28752287 has 12 divisors (see below), whose sum is σ = 30947616. Its totient is φ = 26619840.

The previous prime is 28752259. The next prime is 28752299. The reversal of 28752287 is 78225782.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-28752287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28752257) 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 11 ways as a sum of consecutive naturals, for example, 105962 + ... + 106232.

It is an arithmetic number, because the mean of its divisors is an integer number (2578968).

Almost surely, 2^28752287 is an apocalyptic number.

28752287 is a deficient number, since it is larger than the sum of its proper divisors (2195329).

28752287 is an equidigital number, since it uses as much as digits as its factorization.

28752287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 367 counting only the distinct ones).

The product of its digits is 125440, while the sum is 41.

The square root of 28752287 is about 5362.1159069904. The cubic root of 28752287 is about 306.3544066063.

The spelling of 28752287 in words is "twenty-eight million, seven hundred fifty-two thousand, two hundred eighty-seven".