28252739 has 4 divisors (see below), whose sum is σ = 28352856. Its totient is φ = 28152624.

The previous prime is 28252733. The next prime is 28252747. The reversal of 28252739 is 93725282.

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 28252739 - 2¹² = 28248643 is a prime.

It is a super-2 number, since 2×28252739² = 1596434522004242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28252733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49634 + ... + 50199.

It is an arithmetic number, because the mean of its divisors is an integer number (7088214).

Almost surely, 2^28252739 is an apocalyptic number.

28252739 is a deficient number, since it is larger than the sum of its proper divisors (100117).

28252739 is an equidigital number, since it uses as much as digits as its factorization.

28252739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100116.

The product of its digits is 60480, while the sum is 38.

The square root of 28252739 is about 5315.3305635680. The cubic root of 28252739 is about 304.5698100748.

It can be divided in two parts, 2825273 and 9, that added together give a palindrome (2825282).

The spelling of 28252739 in words is "twenty-eight million, two hundred fifty-two thousand, seven hundred thirty-nine".