28165144458 has 64 divisors (see below), whose sum is σ = 62635773312. Its totient is φ = 8371937280.

The previous prime is 28165144421. The next prime is 28165144507. The reversal of 28165144458 is 85444156182.

It is a super-2 number, since 2×28165144458² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 703960 + ... + 742892.

It is an arithmetic number, because the mean of its divisors is an integer number (978683958).

Almost surely, 2^28165144458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28165144458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31317886656).

28165144458 is an abundant number, since it is smaller than the sum of its proper divisors (34470628854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28165144458 is a wasteful number, since it uses less digits than its factorization.

28165144458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39159.

The product of its digits is 1228800, while the sum is 48.

The spelling of 28165144458 in words is "twenty-eight billion, one hundred sixty-five million, one hundred forty-four thousand, four hundred fifty-eight".