28350643391 has 16 divisors (see below), whose sum is σ = 33138504000. Its totient is φ = 24244303104.

The previous prime is 28350643379. The next prime is 28350643393. The reversal of 28350643391 is 19334605382.

It is not a de Polignac number, because 28350643391 - 2¹⁰ = 28350642367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28350643393) 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, 53075 + ... + 243963.

It is an arithmetic number, because the mean of its divisors is an integer number (2071156500).

Almost surely, 2^28350643391 is an apocalyptic number.

28350643391 is a deficient number, since it is larger than the sum of its proper divisors (4787860609).

28350643391 is an equidigital number, since it uses as much as digits as its factorization.

28350643391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191343 (or 191329 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 28350643391 in words is "twenty-eight billion, three hundred fifty million, six hundred forty-three thousand, three hundred ninety-one".