28775865 has 8 divisors (see below), whose sum is σ = 46041408. Its totient is φ = 15347120.

The previous prime is 28775863. The next prime is 28775867. The reversal of 28775865 is 56857782.

It is an interprime number because it is at equal distance from previous prime (28775863) and next prime (28775867).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28775865 - 2¹ = 28775863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28775863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 959181 + ... + 959210.

It is an arithmetic number, because the mean of its divisors is an integer number (5755176).

Almost surely, 2^28775865 is an apocalyptic number.

It is an amenable number.

28775865 is a deficient number, since it is larger than the sum of its proper divisors (17265543).

28775865 is a wasteful number, since it uses less digits than its factorization.

28775865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918399.

The product of its digits is 940800, while the sum is 48.

The square root of 28775865 is about 5364.3140288391. The cubic root of 28775865 is about 306.4381245920.

The spelling of 28775865 in words is "twenty-eight million, seven hundred seventy-five thousand, eight hundred sixty-five".