28137593 has 4 divisors (see below), whose sum is σ = 30695568. Its totient is φ = 25579620.

The previous prime is 28137589. The next prime is 28137661. The reversal of 28137593 is 39573182.

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 not a de Polignac number, because 28137593 - 2² = 28137589 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28137503) 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, 1278971 + ... + 1278992.

It is an arithmetic number, because the mean of its divisors is an integer number (7673892).

Almost surely, 2^28137593 is an apocalyptic number.

It is an amenable number.

28137593 is a deficient number, since it is larger than the sum of its proper divisors (2557975).

28137593 is a wasteful number, since it uses less digits than its factorization.

28137593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557974.

The product of its digits is 45360, while the sum is 38.

The square root of 28137593 is about 5304.4880054535. The cubic root of 28137593 is about 304.1554815511.

The spelling of 28137593 in words is "twenty-eight million, one hundred thirty-seven thousand, five hundred ninety-three".