28043393 has 8 divisors (see below), whose sum is σ = 32230080. Its totient is φ = 23901840.

The previous prime is 28043381. The next prime is 28043401. The reversal of 28043393 is 39334082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28043393 - 2⁶ = 28043329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28043363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9938 + ... + 12443.

It is an arithmetic number, because the mean of its divisors is an integer number (4028760).

Almost surely, 2^28043393 is an apocalyptic number.

It is an amenable number.

28043393 is a deficient number, since it is larger than the sum of its proper divisors (4186687).

28043393 is a wasteful number, since it uses less digits than its factorization.

28043393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22567.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 28043393 is about 5295.6012878615. The cubic root of 28043393 is about 303.8156813487.

The spelling of 28043393 in words is "twenty-eight million, forty-three thousand, three hundred ninety-three".