28000057 has 4 divisors (see below), whose sum is σ = 28394496. Its totient is φ = 27605620.

The previous prime is 28000031. The next prime is 28000061. The reversal of 28000057 is 75000082.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75000082 = 2 ⋅37500041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28000057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28000087) 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, 197113 + ... + 197254.

It is an arithmetic number, because the mean of its divisors is an integer number (7098624).

Almost surely, 2^28000057 is an apocalyptic number.

It is an amenable number.

28000057 is a deficient number, since it is larger than the sum of its proper divisors (394439).

28000057 is an equidigital number, since it uses as much as digits as its factorization.

28000057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394438.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 28000057 is about 5291.5080081202. The cubic root of 28000057 is about 303.6591032417.

The spelling of 28000057 in words is "twenty-eight million, fifty-seven", and thus it is an aban number and an uban number.