28724593 has 4 divisors (see below), whose sum is σ = 28736740. Its totient is φ = 28712448.

The previous prime is 28724581. The next prime is 28724603. The reversal of 28724593 is 39542782.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12588304 + 16136289 = 3548^2 + 4017^2 .

It is a cyclic number.

It is not a de Polignac number, because 28724593 - 2⁹ = 28724081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28724503) 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, 1248 + ... + 7681.

It is an arithmetic number, because the mean of its divisors is an integer number (7184185).

Almost surely, 2^28724593 is an apocalyptic number.

It is an amenable number.

28724593 is a deficient number, since it is larger than the sum of its proper divisors (12147).

28724593 is an equidigital number, since it uses as much as digits as its factorization.

28724593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12146.

The product of its digits is 120960, while the sum is 40.

The square root of 28724593 is about 5359.5329087524. The cubic root of 28724593 is about 306.2560155420.

The spelling of 28724593 in words is "twenty-eight million, seven hundred twenty-four thousand, five hundred ninety-three".