28057393 has 8 divisors (see below), whose sum is σ = 34532288. Its totient is φ = 22199184.

The previous prime is 28057373. The next prime is 28057397. The reversal of 28057393 is 39375082.

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

It is a de Polignac number, because none of the positive numbers 2^k-28057393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28057397) 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 7 ways as a sum of consecutive naturals, for example, 154071 + ... + 154252.

It is an arithmetic number, because the mean of its divisors is an integer number (4316536).

Almost surely, 2^28057393 is an apocalyptic number.

It is an amenable number.

28057393 is a deficient number, since it is larger than the sum of its proper divisors (6474895).

28057393 is a wasteful number, since it uses less digits than its factorization.

28057393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308343.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 28057393 is about 5296.9229747090. The cubic root of 28057393 is about 303.8662305330.

The spelling of 28057393 in words is "twenty-eight million, fifty-seven thousand, three hundred ninety-three".