28782277 has 4 divisors (see below), whose sum is σ = 28803616. Its totient is φ = 28760940.

The previous prime is 28782253. The next prime is 28782319. The reversal of 28782277 is 77228782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28782277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28782227) 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, 8499 + ... + 11392.

It is an arithmetic number, because the mean of its divisors is an integer number (7200904).

Almost surely, 2^28782277 is an apocalyptic number.

It is an amenable number.

28782277 is a deficient number, since it is larger than the sum of its proper divisors (21339).

28782277 is a wasteful number, since it uses less digits than its factorization.

28782277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21338.

The product of its digits is 175616, while the sum is 43.

The square root of 28782277 is about 5364.9116488531. The cubic root of 28782277 is about 306.4608836569.

The spelling of 28782277 in words is "twenty-eight million, seven hundred eighty-two thousand, two hundred seventy-seven".