28011539 has 4 divisors (see below), whose sum is σ = 29229456. Its totient is φ = 26793624.

The previous prime is 28011527. The next prime is 28011551. The reversal of 28011539 is 93511082.

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

It is an interprime number because it is at equal distance from previous prime (28011527) and next prime (28011551).

It is a cyclic number.

It is not a de Polignac number, because 28011539 - 2⁴ = 28011523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28011839) 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, 608924 + ... + 608969.

It is an arithmetic number, because the mean of its divisors is an integer number (7307364).

Almost surely, 2^28011539 is an apocalyptic number.

28011539 is a deficient number, since it is larger than the sum of its proper divisors (1217917).

28011539 is a wasteful number, since it uses less digits than its factorization.

28011539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217916.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 28011539 is about 5292.5928428323. The cubic root of 28011539 is about 303.7006047923.

The spelling of 28011539 in words is "twenty-eight million, eleven thousand, five hundred thirty-nine".