28763005 has 4 divisors (see below), whose sum is σ = 34515612. Its totient is φ = 23010400.

The previous prime is 28762999. The next prime is 28763011. The reversal of 28763005 is 50036782.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28762999) and next prime (28763011).

It can be written as a sum of positive squares in 2 ways, for example, as 3632836 + 25130169 = 1906^2 + 5013^2 .

It is not a de Polignac number, because 28763005 - 2¹³ = 28754813 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2876296 + ... + 2876305.

It is an arithmetic number, because the mean of its divisors is an integer number (8628903).

Almost surely, 2^28763005 is an apocalyptic number.

It is an amenable number.

28763005 is a deficient number, since it is larger than the sum of its proper divisors (5752607).

28763005 is an equidigital number, since it uses as much as digits as its factorization.

28763005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5752606.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 28763005 is about 5363.1152327728. The cubic root of 28763005 is about 306.3924684901.

Adding to 28763005 its reverse (50036782), we get a palindrome (78799787).

The spelling of 28763005 in words is "twenty-eight million, seven hundred sixty-three thousand, five".