28955665 has 4 divisors (see below), whose sum is σ = 34746804. Its totient is φ = 23164528.

The previous prime is 28955657. The next prime is 28955671. The reversal of 28955665 is 56655982.

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 11641744 + 17313921 = 3412^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 28955665 - 2³ = 28955657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2895562 + ... + 2895571.

It is an arithmetic number, because the mean of its divisors is an integer number (8686701).

Almost surely, 2^28955665 is an apocalyptic number.

It is an amenable number.

28955665 is a deficient number, since it is larger than the sum of its proper divisors (5791139).

28955665 is an equidigital number, since it uses as much as digits as its factorization.

28955665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791138.

The product of its digits is 648000, while the sum is 46.

The square root of 28955665 is about 5381.0468312402. The cubic root of 28955665 is about 307.0750381567.

The spelling of 28955665 in words is "twenty-eight million, nine hundred fifty-five thousand, six hundred sixty-five".