28138593 has 24 divisors (see below), whose sum is σ = 44310432. Its totient is φ = 15833664.

The previous prime is 28138573. The next prime is 28138597. The reversal of 28138593 is 39583182.

It is not a de Polignac number, because 28138593 - 2⁶ = 28138529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28138597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8421 + ... + 11277.

It is an arithmetic number, because the mean of its divisors is an integer number (1846268).

Almost surely, 2^28138593 is an apocalyptic number.

It is an amenable number.

28138593 is a deficient number, since it is larger than the sum of its proper divisors (16171839).

28138593 is a wasteful number, since it uses less digits than its factorization.

28138593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941 (or 2934 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 28138593 is about 5304.5822644201. The cubic root of 28138593 is about 304.1590847008.

It can be divided in two parts, 2 and 8138593, that added together give a triangular number (8138595 = T₄₀₃₄).

The spelling of 28138593 in words is "twenty-eight million, one hundred thirty-eight thousand, five hundred ninety-three".