28334613891 has 8 divisors (see below), whose sum is σ = 37782085824. Its totient is φ = 18888442280.

The previous prime is 28334613889. The next prime is 28334613919. The reversal of 28334613891 is 19831643382.

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 28334613891 - 2¹ = 28334613889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28334613891.

It is not an unprimeable number, because it can be changed into a prime (28334613851) 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, 273045 + ... + 362246.

It is an arithmetic number, because the mean of its divisors is an integer number (4722760728).

Almost surely, 2^28334613891 is an apocalyptic number.

28334613891 is a deficient number, since it is larger than the sum of its proper divisors (9447471933).

28334613891 is a wasteful number, since it uses less digits than its factorization.

28334613891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650161.

The product of its digits is 746496, while the sum is 48.

The spelling of 28334613891 in words is "twenty-eight billion, three hundred thirty-four million, six hundred thirteen thousand, eight hundred ninety-one".