28455317 has 4 divisors (see below), whose sum is σ = 31042176. Its totient is φ = 25868460.

The previous prime is 28455313. The next prime is 28455319. The reversal of 28455317 is 71355482.

It is a happy number.

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 28455317 - 2² = 28455313 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28455313) 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, 1293413 + ... + 1293434.

It is an arithmetic number, because the mean of its divisors is an integer number (7760544).

Almost surely, 2^28455317 is an apocalyptic number.

It is an amenable number.

28455317 is a deficient number, since it is larger than the sum of its proper divisors (2586859).

28455317 is a wasteful number, since it uses less digits than its factorization.

28455317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586858.

The product of its digits is 33600, while the sum is 35.

The square root of 28455317 is about 5334.3525380312. The cubic root of 28455317 is about 305.2960200468.

The spelling of 28455317 in words is "twenty-eight million, four hundred fifty-five thousand, three hundred seventeen".