28973257 has 8 divisors (see below), whose sum is σ = 29872256. Its totient is φ = 28080432.

The previous prime is 28973249. The next prime is 28973293. The reversal of 28973257 is 75237982.

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 28973257 - 2³ = 28973249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28973207) 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, 9088 + ... + 11854.

It is an arithmetic number, because the mean of its divisors is an integer number (3734032).

Almost surely, 2^28973257 is an apocalyptic number.

It is an amenable number.

28973257 is a deficient number, since it is larger than the sum of its proper divisors (898999).

28973257 is a wasteful number, since it uses less digits than its factorization.

28973257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087.

The product of its digits is 211680, while the sum is 43.

The square root of 28973257 is about 5382.6812092116. The cubic root of 28973257 is about 307.1372133296.

The spelling of 28973257 in words is "twenty-eight million, nine hundred seventy-three thousand, two hundred fifty-seven".