28021634311 has 16 divisors (see below), whose sum is σ = 30665537280. Its totient is φ = 25393947520.

The previous prime is 28021634281. The next prime is 28021634317. The reversal of 28021634311 is 11343612082.

It is a cyclic number.

It is not a de Polignac number, because 28021634311 - 2¹¹ = 28021632263 is a prime.

It is a super-3 number, since 3×28021634311³ (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 (28021634317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5193231 + ... + 5198623.

It is an arithmetic number, because the mean of its divisors is an integer number (1916596080).

Almost surely, 2^28021634311 is an apocalyptic number.

28021634311 is a deficient number, since it is larger than the sum of its proper divisors (2643902969).

28021634311 is a wasteful number, since it uses less digits than its factorization.

28021634311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6806.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 28021634311 in words is "twenty-eight billion, twenty-one million, six hundred thirty-four thousand, three hundred eleven".