28529117 has 4 divisors (see below), whose sum is σ = 28626780. Its totient is φ = 28431456.

The previous prime is 28529113. The next prime is 28529159. The reversal of 28529117 is 71192582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28026436 + 502681 = 5294^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 28529117 - 2² = 28529113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28529113) 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, 48392 + ... + 48977.

It is an arithmetic number, because the mean of its divisors is an integer number (7156695).

Almost surely, 2^28529117 is an apocalyptic number.

It is an amenable number.

28529117 is a deficient number, since it is larger than the sum of its proper divisors (97663).

28529117 is an equidigital number, since it uses as much as digits as its factorization.

28529117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97662.

The product of its digits is 10080, while the sum is 35.

The square root of 28529117 is about 5341.2654867550. The cubic root of 28529117 is about 305.5597246716.

The spelling of 28529117 in words is "twenty-eight million, five hundred twenty-nine thousand, one hundred seventeen".