28057537 has 4 divisors (see below), whose sum is σ = 28097280. Its totient is φ = 28017796.

The previous prime is 28057501. The next prime is 28057553. The reversal of 28057537 is 73575082.

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 28057537 - 2⁷ = 28057409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28057496 and 28057505.

It is not an unprimeable number, because it can be changed into a prime (28057577) 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 3 ways as a sum of consecutive naturals, for example, 18793 + ... + 20230.

It is an arithmetic number, because the mean of its divisors is an integer number (7024320).

Almost surely, 2^28057537 is an apocalyptic number.

It is an amenable number.

28057537 is a deficient number, since it is larger than the sum of its proper divisors (39743).

28057537 is an equidigital number, since it uses as much as digits as its factorization.

28057537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39742.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 28057537 is about 5296.9365674888. The cubic root of 28057537 is about 303.8667503801.

The spelling of 28057537 in words is "twenty-eight million, fifty-seven thousand, five hundred thirty-seven".