28538519 has 4 divisors (see below), whose sum is σ = 28815696. Its totient is φ = 28261344.

The previous prime is 28538491. The next prime is 28538527. The reversal of 28538519 is 91583582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91583582 = 2 ⋅45791791.

It is a cyclic number.

It is not a de Polignac number, because 28538519 - 2¹² = 28534423 is a prime.

It is a super-2 number, since 2×28538519² = 1628894133426722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28538579) 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, 138434 + ... + 138639.

It is an arithmetic number, because the mean of its divisors is an integer number (7203924).

Almost surely, 2^28538519 is an apocalyptic number.

28538519 is a deficient number, since it is larger than the sum of its proper divisors (277177).

28538519 is a wasteful number, since it uses less digits than its factorization.

28538519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277176.

The product of its digits is 86400, while the sum is 41.

The square root of 28538519 is about 5342.1455427571. The cubic root of 28538519 is about 305.5932875400.

The spelling of 28538519 in words is "twenty-eight million, five hundred thirty-eight thousand, five hundred nineteen".