28256533277 has 8 divisors (see below), whose sum is σ = 32822577792. Its totient is φ = 23822838000.

The previous prime is 28256533243. The next prime is 28256533303. The reversal of 28256533277 is 77233565282.

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 28256533277 - 2⁸ = 28256533021 is a prime.

It is a super-3 number, since 3×28256533277³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28256535277) 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, 33086849 + ... + 33087702.

It is an arithmetic number, because the mean of its divisors is an integer number (4102822224).

Almost surely, 2^28256533277 is an apocalyptic number.

It is an amenable number.

28256533277 is a deficient number, since it is larger than the sum of its proper divisors (4566044515).

28256533277 is an equidigital number, since it uses as much as digits as its factorization.

28256533277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66174619.

The product of its digits is 4233600, while the sum is 50.

The spelling of 28256533277 in words is "twenty-eight billion, two hundred fifty-six million, five hundred thirty-three thousand, two hundred seventy-seven".