28057039 has 4 divisors (see below), whose sum is σ = 28441456. Its totient is φ = 27672624.

The previous prime is 28057019. The next prime is 28057049. The reversal of 28057039 is 93075082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28057039 - 2¹⁷ = 27925967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28056995 and 28057013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057009) 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, 192099 + ... + 192244.

It is an arithmetic number, because the mean of its divisors is an integer number (7110364).

Almost surely, 2^28057039 is an apocalyptic number.

28057039 is a deficient number, since it is larger than the sum of its proper divisors (384417).

28057039 is an equidigital number, since it uses as much as digits as its factorization.

28057039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384416.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 28057039 is about 5296.8895589770. The cubic root of 28057039 is about 303.8649525680.

The spelling of 28057039 in words is "twenty-eight million, fifty-seven thousand, thirty-nine".