28038293 has 4 divisors (see below), whose sum is σ = 28353420. Its totient is φ = 27723168.

The previous prime is 28038277. The next prime is 28038299. The reversal of 28038293 is 39283082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39283082 = 2 ⋅19641541.

It can be written as a sum of positive squares in 2 ways, for example, as 2007889 + 26030404 = 1417^2 + 5102^2 .

It is a cyclic number.

It is not a de Polignac number, because 28038293 - 2⁴ = 28038277 is a prime.

It is a super-2 number, since 2×28038293² = 1572291748707698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28038299) 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, 157430 + ... + 157607.

It is an arithmetic number, because the mean of its divisors is an integer number (7088355).

Almost surely, 2^28038293 is an apocalyptic number.

It is an amenable number.

28038293 is a deficient number, since it is larger than the sum of its proper divisors (315127).

28038293 is an equidigital number, since it uses as much as digits as its factorization.

28038293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315126.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 28038293 is about 5295.1197342459. The cubic root of 28038293 is about 303.7972628224.

The spelling of 28038293 in words is "twenty-eight million, thirty-eight thousand, two hundred ninety-three".