28783277 has 8 divisors (see below), whose sum is σ = 29354520. Its totient is φ = 28215360.

The previous prime is 28783219. The next prime is 28783301. The reversal of 28783277 is 77238782.

It can be written as a sum of positive squares in 4 ways, for example, as 3189796 + 25593481 = 1786^2 + 5059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28783277 - 2¹⁰ = 28782253 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 (28783217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23123 + ... + 24335.

It is an arithmetic number, because the mean of its divisors is an integer number (3669315).

Almost surely, 2^28783277 is an apocalyptic number.

It is an amenable number.

28783277 is a deficient number, since it is larger than the sum of its proper divisors (571243).

28783277 is a wasteful number, since it uses less digits than its factorization.

28783277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663.

The product of its digits is 263424, while the sum is 44.

The square root of 28783277 is about 5365.0048462233. The cubic root of 28783277 is about 306.4644328008.

The spelling of 28783277 in words is "twenty-eight million, seven hundred eighty-three thousand, two hundred seventy-seven".