28645565 has 16 divisors (see below), whose sum is σ = 37532208. Its totient is φ = 20860416.

The previous prime is 28645531. The next prime is 28645567. The reversal of 28645565 is 56554682.

It can be written as a sum of positive squares in 8 ways, for example, as 4251844 + 24393721 = 2062^2 + 4939^2 .

It is a cyclic number.

It is not a de Polignac number, because 28645565 - 2²⁴ = 11868349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645567) 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, 1727 + ... + 7763.

It is an arithmetic number, because the mean of its divisors is an integer number (2345763).

Almost surely, 2^28645565 is an apocalyptic number.

It is an amenable number.

28645565 is a deficient number, since it is larger than the sum of its proper divisors (8886643).

28645565 is a wasteful number, since it uses less digits than its factorization.

28645565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6128.

The product of its digits is 288000, while the sum is 41.

The square root of 28645565 is about 5352.1551733858. The cubic root of 28645565 is about 305.9748971960.

The spelling of 28645565 in words is "twenty-eight million, six hundred forty-five thousand, five hundred sixty-five".