28257337 has 4 divisors (see below), whose sum is σ = 29168896. Its totient is φ = 27345780.

The previous prime is 28257319. The next prime is 28257343. The reversal of 28257337 is 73375282.

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 28257337 - 2¹¹ = 28255289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28257296 and 28257305.

It is not an unprimeable number, because it can be changed into a prime (28257347) 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, 455733 + ... + 455794.

It is an arithmetic number, because the mean of its divisors is an integer number (7292224).

Almost surely, 2^28257337 is an apocalyptic number.

It is an amenable number.

28257337 is a deficient number, since it is larger than the sum of its proper divisors (911559).

28257337 is an equidigital number, since it uses as much as digits as its factorization.

28257337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911558.

The product of its digits is 70560, while the sum is 37.

The square root of 28257337 is about 5315.7630684597. The cubic root of 28257337 is about 304.5863316119.

The spelling of 28257337 in words is "twenty-eight million, two hundred fifty-seven thousand, three hundred thirty-seven".