28936393 has 4 divisors (see below), whose sum is σ = 28983760. Its totient is φ = 28889028.

The previous prime is 28936381. The next prime is 28936409. The reversal of 28936393 is 39363982.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28936393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28936333) 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, 22755 + ... + 23992.

It is an arithmetic number, because the mean of its divisors is an integer number (7245940).

Almost surely, 2^28936393 is an apocalyptic number.

It is an amenable number.

28936393 is a deficient number, since it is larger than the sum of its proper divisors (47367).

28936393 is an equidigital number, since it uses as much as digits as its factorization.

28936393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47366.

The product of its digits is 209952, while the sum is 43.

The square root of 28936393 is about 5379.2558035476. The cubic root of 28936393 is about 307.0068964700.

The spelling of 28936393 in words is "twenty-eight million, nine hundred thirty-six thousand, three hundred ninety-three".