28161224175 has 24 divisors (see below), whose sum is σ = 53211304576. Its totient is φ = 12873702240.

The previous prime is 28161224171. The next prime is 28161224293. The reversal of 28161224175 is 57142216182.

It is not a de Polignac number, because 28161224175 - 2² = 28161224171 is a prime.

It is a super-4 number, since 4×28161224175⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161224171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26819689 + ... + 26820738.

Almost surely, 2^28161224175 is an apocalyptic number.

28161224175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28161224175 is a deficient number, since it is larger than the sum of its proper divisors (25050080401).

28161224175 is a wasteful number, since it uses less digits than its factorization.

28161224175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53640447 (or 53640442 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The spelling of 28161224175 in words is "twenty-eight billion, one hundred sixty-one million, two hundred twenty-four thousand, one hundred seventy-five".