28817657 has 4 divisors (see below), whose sum is σ = 31437456. Its totient is φ = 26197860.

The previous prime is 28817653. The next prime is 28817671. The reversal of 28817657 is 75671882.

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 28817657 - 2² = 28817653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28817651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1309883 + ... + 1309904.

It is an arithmetic number, because the mean of its divisors is an integer number (7859364).

Almost surely, 2^28817657 is an apocalyptic number.

It is an amenable number.

28817657 is a deficient number, since it is larger than the sum of its proper divisors (2619799).

28817657 is a wasteful number, since it uses less digits than its factorization.

28817657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619798.

The product of its digits is 188160, while the sum is 44.

The square root of 28817657 is about 5368.2079877739. The cubic root of 28817657 is about 306.5864024084.

The spelling of 28817657 in words is "twenty-eight million, eight hundred seventeen thousand, six hundred fifty-seven".