28743277 has 4 divisors (see below), whose sum is σ = 30434076. Its totient is φ = 27052480.

The previous prime is 28743269. The next prime is 28743289. The reversal of 28743277 is 77234782.

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 13329801 + 15413476 = 3651^2 + 3926^2 .

It is a cyclic number.

It is not a de Polignac number, because 28743277 - 2³ = 28743269 is a prime.

It is a Smith number, since the sum of its digits (40) 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 not an unprimeable number, because it can be changed into a prime (28743577) 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, 845374 + ... + 845407.

It is an arithmetic number, because the mean of its divisors is an integer number (7608519).

Almost surely, 2^28743277 is an apocalyptic number.

It is an amenable number.

28743277 is a deficient number, since it is larger than the sum of its proper divisors (1690799).

28743277 is a wasteful number, since it uses less digits than its factorization.

28743277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690798.

The product of its digits is 131712, while the sum is 40.

The square root of 28743277 is about 5361.2756877445. The cubic root of 28743277 is about 306.3224028730.

The spelling of 28743277 in words is "twenty-eight million, seven hundred forty-three thousand, two hundred seventy-seven".