28865961 has 6 divisors (see below), whose sum is σ = 41695290. Its totient is φ = 19243968.

The previous prime is 28865911. The next prime is 28865987. The reversal of 28865961 is 16956882.

It can be written as a sum of positive squares in only one way, i.e., 26163225 + 2702736 = 5115^2 + 1644^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28865961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28865911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1603656 + ... + 1603673.

It is an arithmetic number, because the mean of its divisors is an integer number (6949215).

Almost surely, 2^28865961 is an apocalyptic number.

It is an amenable number.

28865961 is a deficient number, since it is larger than the sum of its proper divisors (12829329).

28865961 is a wasteful number, since it uses less digits than its factorization.

28865961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3207335 (or 3207332 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 28865961 is about 5372.7051845416. The cubic root of 28865961 is about 306.7576062740.

The spelling of 28865961 in words is "twenty-eight million, eight hundred sixty-five thousand, nine hundred sixty-one".