28277065 has 16 divisors (see below), whose sum is σ = 35029008. Its totient is φ = 21897216.

The previous prime is 28277063. The next prime is 28277083. The reversal of 28277065 is 56077282.

It can be written as a sum of positive squares in 8 ways, for example, as 356409 + 27920656 = 597^2 + 5284^2 .

It is a cyclic number.

It is not a de Polignac number, because 28277065 - 2¹ = 28277063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28277063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65089 + ... + 65521.

It is an arithmetic number, because the mean of its divisors is an integer number (2189313).

Almost surely, 2^28277065 is an apocalyptic number.

It is an amenable number.

28277065 is a deficient number, since it is larger than the sum of its proper divisors (6751943).

28277065 is a wasteful number, since it uses less digits than its factorization.

28277065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 28277065 is about 5317.6183578741. The cubic root of 28277065 is about 304.6571979420.

The spelling of 28277065 in words is "twenty-eight million, two hundred seventy-seven thousand, sixty-five".