28285777 has 8 divisors (see below), whose sum is σ = 31205160. Its totient is φ = 25472640.

The previous prime is 28285753. The next prime is 28285781. The reversal of 28285777 is 77758282.

It can be written as a sum of positive squares in 4 ways, for example, as 1752976 + 26532801 = 1324^2 + 5151^2 .

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 28285777 - 2²³ = 19897169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28285177) 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, 26002 + ... + 27067.

It is an arithmetic number, because the mean of its divisors is an integer number (3900645).

Almost surely, 2^28285777 is an apocalyptic number.

It is an amenable number.

28285777 is a deficient number, since it is larger than the sum of its proper divisors (2919383).

28285777 is a wasteful number, since it uses less digits than its factorization.

28285777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53123.

The product of its digits is 439040, while the sum is 46.

The square root of 28285777 is about 5318.4374585023. The cubic root of 28285777 is about 304.6884824356.

The spelling of 28285777 in words is "twenty-eight million, two hundred eighty-five thousand, seven hundred seventy-seven".