28773065 has 4 divisors (see below), whose sum is σ = 34527684. Its totient is φ = 23018448.

The previous prime is 28773037. The next prime is 28773067. The reversal of 28773065 is 56037782.

It is a happy number.

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 17131321 + 11641744 = 4139^2 + 3412^2 .

It is a cyclic number.

It is not a de Polignac number, because 28773065 - 2⁶ = 28773001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28773067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2877302 + ... + 2877311.

It is an arithmetic number, because the mean of its divisors is an integer number (8631921).

Almost surely, 2^28773065 is an apocalyptic number.

It is an amenable number.

28773065 is a deficient number, since it is larger than the sum of its proper divisors (5754619).

28773065 is an equidigital number, since it uses as much as digits as its factorization.

28773065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5754618.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 28773065 is about 5364.0530385148. The cubic root of 28773065 is about 306.4281850753.

The spelling of 28773065 in words is "twenty-eight million, seven hundred seventy-three thousand, sixty-five".