28557717 has 16 divisors (see below), whose sum is σ = 39067392. Its totient is φ = 18547200.

The previous prime is 28557707. The next prime is 28557731. The reversal of 28557717 is 71775582.

It is not a de Polignac number, because 28557717 - 2⁴ = 28557701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28557707) 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 15 ways as a sum of consecutive naturals, for example, 47217 + ... + 47817.

It is an arithmetic number, because the mean of its divisors is an integer number (2441712).

Almost surely, 2^28557717 is an apocalyptic number.

It is an amenable number.

28557717 is a deficient number, since it is larger than the sum of its proper divisors (10509675).

28557717 is a wasteful number, since it uses less digits than its factorization.

28557717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its digits is 137200, while the sum is 42.

The square root of 28557717 is about 5343.9420842670. The cubic root of 28557717 is about 305.6617968751.

The spelling of 28557717 in words is "twenty-eight million, five hundred fifty-seven thousand, seven hundred seventeen".