28029539 has 4 divisors (see below), whose sum is σ = 28155456. Its totient is φ = 27903624.

The previous prime is 28029523. The next prime is 28029553. The reversal of 28029539 is 93592082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93592082 = 2 ⋅46796041.

It is a cyclic number.

It is not a de Polignac number, because 28029539 - 2⁴ = 28029523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28029569) 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, 62624 + ... + 63069.

It is an arithmetic number, because the mean of its divisors is an integer number (7038864).

Almost surely, 2^28029539 is an apocalyptic number.

28029539 is a deficient number, since it is larger than the sum of its proper divisors (125917).

28029539 is a wasteful number, since it uses less digits than its factorization.

28029539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125916.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 28029539 is about 5294.2930595123. The cubic root of 28029539 is about 303.7656427560.

The spelling of 28029539 in words is "twenty-eight million, twenty-nine thousand, five hundred thirty-nine".