28117644 has 24 divisors (see below), whose sum is σ = 69061440. Its totient is φ = 8879184.

The previous prime is 28117627. The next prime is 28117699. The reversal of 28117644 is 44671182.

It is a super-2 number, since 2×28117644² = 1581203808221472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61434 + ... + 61889.

It is an arithmetic number, because the mean of its divisors is an integer number (2877560).

Almost surely, 2^28117644 is an apocalyptic number.

It is an amenable number.

28117644 is an abundant number, since it is smaller than the sum of its proper divisors (40943796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28117644 is a wasteful number, since it uses less digits than its factorization.

28117644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123349 (or 123347 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 28117644 is about 5302.6072832146. The cubic root of 28117644 is about 304.0835844726.

The spelling of 28117644 in words is "twenty-eight million, one hundred seventeen thousand, six hundred forty-four".