28763785 has 4 divisors (see below), whose sum is σ = 34516548. Its totient is φ = 23011024.

The previous prime is 28763783. The next prime is 28763797. The reversal of 28763785 is 58736782.

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 15976009 + 12787776 = 3997^2 + 3576^2 .

It is a cyclic number.

It is not a de Polignac number, because 28763785 - 2¹ = 28763783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28763783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2876374 + ... + 2876383.

It is an arithmetic number, because the mean of its divisors is an integer number (8629137).

Almost surely, 2^28763785 is an apocalyptic number.

It is an amenable number.

28763785 is a deficient number, since it is larger than the sum of its proper divisors (5752763).

28763785 is an equidigital number, since it uses as much as digits as its factorization.

28763785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5752762.

The product of its digits is 564480, while the sum is 46.

The square root of 28763785 is about 5363.1879512096. The cubic root of 28763785 is about 306.3952380659.

The spelling of 28763785 in words is "twenty-eight million, seven hundred sixty-three thousand, seven hundred eighty-five".