28432367161 has 9 divisors (see below), whose sum is σ = 31254144943. Its totient is φ = 25845920320.

The previous prime is 28432367153. The next prime is 28432367167. The reversal of 28432367161 is 16176323482.

The square root of 28432367161 is 168619.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2640007161 + 25792360000 = 51381^2 + 160600^2 .

It is not a de Polignac number, because 28432367161 - 2³ = 28432367153 is a prime.

It is a super-2 number, since 2×28432367161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28432367167) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1847145 + ... + 1862473.

Almost surely, 2^28432367161 is an apocalyptic number.

28432367161 is the 168619-th square number.

28432367161 is the 84310-th centered octagonal number.

It is an amenable number.

28432367161 is a deficient number, since it is larger than the sum of its proper divisors (2821777782).

28432367161 is an frugal number, since it uses more digits than its factorization.

28432367161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30680 (or 15340 counting only the distinct ones).

The product of its digits is 290304, while the sum is 43.

It can be divided in two parts, 28432 and 367161, that added together give a palindrome (395593).

The spelling of 28432367161 in words is "twenty-eight billion, four hundred thirty-two million, three hundred sixty-seven thousand, one hundred sixty-one".