28257897 has 8 divisors (see below), whose sum is σ = 38596320. Its totient is φ = 18379040.

The previous prime is 28257847. The next prime is 28257907. The reversal of 28257897 is 79875282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28257897 - 2²⁰ = 27209321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28257847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114747 + ... + 114992.

It is an arithmetic number, because the mean of its divisors is an integer number (4824540).

Almost surely, 2^28257897 is an apocalyptic number.

It is an amenable number.

28257897 is a deficient number, since it is larger than the sum of its proper divisors (10338423).

28257897 is a wasteful number, since it uses less digits than its factorization.

28257897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229783.

The product of its digits is 564480, while the sum is 48.

The square root of 28257897 is about 5315.8157417277. The cubic root of 28257897 is about 304.5883436819.

The spelling of 28257897 in words is "twenty-eight million, two hundred fifty-seven thousand, eight hundred ninety-seven".