28129593 has 4 divisors (see below), whose sum is σ = 37506128. Its totient is φ = 18753060.

The previous prime is 28129559. The next prime is 28129603. The reversal of 28129593 is 39592182.

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 de Polignac number, because none of the positive numbers 2^k-28129593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28129513) 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, 4688263 + ... + 4688268.

It is an arithmetic number, because the mean of its divisors is an integer number (9376532).

Almost surely, 2^28129593 is an apocalyptic number.

It is an amenable number.

28129593 is a deficient number, since it is larger than the sum of its proper divisors (9376535).

28129593 is an equidigital number, since it uses as much as digits as its factorization.

28129593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9376534.

The product of its digits is 38880, while the sum is 39.

The square root of 28129593 is about 5303.7338734141. The cubic root of 28129593 is about 304.1266532798.

The spelling of 28129593 in words is "twenty-eight million, one hundred twenty-nine thousand, five hundred ninety-three".