28051393 has 4 divisors (see below), whose sum is σ = 28177408. Its totient is φ = 27925380.

The previous prime is 28051369. The next prime is 28051403. The reversal of 28051393 is 39315082.

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 not a de Polignac number, because 28051393 - 2⁹ = 28050881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28051193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62673 + ... + 63118.

It is an arithmetic number, because the mean of its divisors is an integer number (7044352).

Almost surely, 2^28051393 is an apocalyptic number.

It is an amenable number.

28051393 is a deficient number, since it is larger than the sum of its proper divisors (126015).

28051393 is a wasteful number, since it uses less digits than its factorization.

28051393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126014.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 28051393 is about 5296.3565778750. The cubic root of 28051393 is about 303.8445686564.

The spelling of 28051393 in words is "twenty-eight million, fifty-one thousand, three hundred ninety-three".