28773765 has 16 divisors (see below), whose sum is σ = 51153600. Its totient is φ = 15345936.

The previous prime is 28773749. The next prime is 28773779. The reversal of 28773765 is 56737782.

It is not a de Polignac number, because 28773765 - 2⁴ = 28773749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28773765.

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 15 ways as a sum of consecutive naturals, for example, 106435 + ... + 106704.

It is an arithmetic number, because the mean of its divisors is an integer number (3197100).

Almost surely, 2^28773765 is an apocalyptic number.

It is an amenable number.

28773765 is a deficient number, since it is larger than the sum of its proper divisors (22379835).

28773765 is a wasteful number, since it uses less digits than its factorization.

28773765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213153 (or 213147 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 28773765 is about 5364.1182872864. The cubic root of 28773765 is about 306.4306700149.

The spelling of 28773765 in words is "twenty-eight million, seven hundred seventy-three thousand, seven hundred sixty-five".