28506393 has 12 divisors (see below), whose sum is σ = 42052608. Its totient is φ = 18599640.

The previous prime is 28506389. The next prime is 28506409. The reversal of 28506393 is 39360582.

It is not a de Polignac number, because 28506393 - 2² = 28506389 is a prime.

It is a super-2 number, since 2×28506393² = 1625228883740898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28506323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33273 + ... + 34118.

It is an arithmetic number, because the mean of its divisors is an integer number (3504384).

Almost surely, 2^28506393 is an apocalyptic number.

It is an amenable number.

28506393 is a deficient number, since it is larger than the sum of its proper divisors (13546215).

28506393 is a wasteful number, since it uses less digits than its factorization.

28506393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67444 (or 67441 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 28506393 is about 5339.1378517510. The cubic root of 28506393 is about 305.4785750219.

It can be divided in two parts, 285063 and 93, that added together give a square (285156 = 534²).

The spelling of 28506393 in words is "twenty-eight million, five hundred six thousand, three hundred ninety-three".