28307528311 has 4 divisors (see below), whose sum is σ = 28409721832. Its totient is φ = 28205334792.

The previous prime is 28307528303. The next prime is 28307528317. The reversal of 28307528311 is 11382570382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11382570382 = 2 ⋅5691285191.

It is a cyclic number.

It is not a de Polignac number, because 28307528311 - 2³ = 28307528303 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 (28307528317) 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 3 ways as a sum of consecutive naturals, for example, 51096345 + ... + 51096898.

It is an arithmetic number, because the mean of its divisors is an integer number (7102430458).

Almost surely, 2^28307528311 is an apocalyptic number.

28307528311 is a deficient number, since it is larger than the sum of its proper divisors (102193521).

28307528311 is a wasteful number, since it uses less digits than its factorization.

28307528311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102193520.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 28307528311 in words is "twenty-eight billion, three hundred seven million, five hundred twenty-eight thousand, three hundred eleven".