28309284913 has 16 divisors (see below), whose sum is σ = 34855098880. Its totient is φ = 22390261056.

The previous prime is 28309284911. The next prime is 28309284919. The reversal of 28309284913 is 31948290382.

It is a cyclic number.

It is not a de Polignac number, because 28309284913 - 2¹ = 28309284911 is a prime.

It is a super-2 number, since 2×28309284913² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28309284911) 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, 195583 + ... + 308011.

It is an arithmetic number, because the mean of its divisors is an integer number (2178443680).

Almost surely, 2^28309284913 is an apocalyptic number.

It is an amenable number.

28309284913 is a deficient number, since it is larger than the sum of its proper divisors (6545813967).

28309284913 is a wasteful number, since it uses less digits than its factorization.

28309284913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115216.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 28309284913 in words is "twenty-eight billion, three hundred nine million, two hundred eighty-four thousand, nine hundred thirteen".