28161411861 has 12 divisors (see below), whose sum is σ = 41272372736. Its totient is φ = 17067522120.

The previous prime is 28161411851. The next prime is 28161411907. The reversal of 28161411861 is 16811416182.

It is not a de Polignac number, because 28161411861 - 2¹⁸ = 28161149717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161411821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38789461 + ... + 38790186.

Almost surely, 2^28161411861 is an apocalyptic number.

It is an amenable number.

28161411861 is a deficient number, since it is larger than the sum of its proper divisors (13110960875).

28161411861 is a wasteful number, since it uses less digits than its factorization.

28161411861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77579672 (or 77579661 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The spelling of 28161411861 in words is "twenty-eight billion, one hundred sixty-one million, four hundred eleven thousand, eight hundred sixty-one".