28661817 has 8 divisors (see below), whose sum is σ = 38937024. Its totient is φ = 18747248.

The previous prime is 28661807. The next prime is 28661819. The reversal of 28661817 is 71816682.

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 28661817 - 2⁸ = 28661561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28661819) 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 7 ways as a sum of consecutive naturals, for example, 89973 + ... + 90290.

It is an arithmetic number, because the mean of its divisors is an integer number (4867128).

Almost surely, 2^28661817 is an apocalyptic number.

It is an amenable number.

28661817 is a deficient number, since it is larger than the sum of its proper divisors (10275207).

28661817 is a wasteful number, since it uses less digits than its factorization.

28661817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180319.

The product of its digits is 32256, while the sum is 39.

The square root of 28661817 is about 5353.6732249924. The cubic root of 28661817 is about 306.0327509907.

The spelling of 28661817 in words is "twenty-eight million, six hundred sixty-one thousand, eight hundred seventeen".