28617965 has 4 divisors (see below), whose sum is σ = 34341564. Its totient is φ = 22894368.

The previous prime is 28617961. The next prime is 28617977. The reversal of 28617965 is 56971682.

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 11162281 + 17455684 = 3341^2 + 4178^2 .

It is a cyclic number.

It is not a de Polignac number, because 28617965 - 2² = 28617961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28617961) 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, 2861792 + ... + 2861801.

It is an arithmetic number, because the mean of its divisors is an integer number (8585391).

Almost surely, 2^28617965 is an apocalyptic number.

It is an amenable number.

28617965 is a deficient number, since it is larger than the sum of its proper divisors (5723599).

28617965 is an equidigital number, since it uses as much as digits as its factorization.

28617965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5723598.

The product of its digits is 181440, while the sum is 44.

The square root of 28617965 is about 5349.5761514348. The cubic root of 28617965 is about 305.8765966873.

The spelling of 28617965 in words is "twenty-eight million, six hundred seventeen thousand, nine hundred sixty-five".