28280785277 has 8 divisors (see below), whose sum is σ = 29780780160. Its totient is φ = 26781943680.

The previous prime is 28280785261. The next prime is 28280785321. The reversal of 28280785277 is 77258708282.

It is a happy number.

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 28280785277 - 2⁴ = 28280785261 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 (28280785207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237749 + ... + 336282.

It is an arithmetic number, because the mean of its divisors is an integer number (3722597520).

Almost surely, 2^28280785277 is an apocalyptic number.

It is an amenable number.

28280785277 is a deficient number, since it is larger than the sum of its proper divisors (1499994883).

28280785277 is a wasteful number, since it uses less digits than its factorization.

28280785277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576643.

The product of its (nonzero) digits is 7024640, while the sum is 56.

The spelling of 28280785277 in words is "twenty-eight billion, two hundred eighty million, seven hundred eighty-five thousand, two hundred seventy-seven".