28733765 has 4 divisors (see below), whose sum is σ = 34480524. Its totient is φ = 22987008.

The previous prime is 28733759. The next prime is 28733797. The reversal of 28733765 is 56733782.

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 10975969 + 17757796 = 3313^2 + 4214^2 .

It is a cyclic number.

It is not a de Polignac number, because 28733765 - 2⁶ = 28733701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2873372 + ... + 2873381.

It is an arithmetic number, because the mean of its divisors is an integer number (8620131).

Almost surely, 2^28733765 is an apocalyptic number.

It is an amenable number.

28733765 is a deficient number, since it is larger than the sum of its proper divisors (5746759).

28733765 is an equidigital number, since it uses as much as digits as its factorization.

28733765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5746758.

The product of its digits is 211680, while the sum is 41.

The square root of 28733765 is about 5360.3885120390. The cubic root of 28733765 is about 306.2886087656.

The spelling of 28733765 in words is "twenty-eight million, seven hundred thirty-three thousand, seven hundred sixty-five".