28539793 has 4 divisors (see below), whose sum is σ = 28689408. Its totient is φ = 28390180.

The previous prime is 28539781. The next prime is 28539853. The reversal of 28539793 is 39793582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28539793 - 2²¹ = 26442641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28539733) 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, 74521 + ... + 74902.

It is an arithmetic number, because the mean of its divisors is an integer number (7172352).

Almost surely, 2^28539793 is an apocalyptic number.

It is an amenable number.

28539793 is a deficient number, since it is larger than the sum of its proper divisors (149615).

28539793 is a wasteful number, since it uses less digits than its factorization.

28539793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149614.

The product of its digits is 408240, while the sum is 46.

The square root of 28539793 is about 5342.2647819066. The cubic root of 28539793 is about 305.5978348450.

The spelling of 28539793 in words is "twenty-eight million, five hundred thirty-nine thousand, seven hundred ninety-three".