28464640157161 has 4 divisors (see below), whose sum is σ = 30654227861572. Its totient is φ = 26275052452752.

The previous prime is 28464640157131. The next prime is 28464640157197. The reversal of 28464640157161 is 16175104646482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8357765360400 + 20106874796761 = 2890980^2 + 4484069^2 .

It is a cyclic number.

It is not a de Polignac number, because 28464640157161 - 2¹¹ = 28464640155113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28464640157131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094793852186 + ... + 1094793852211.

It is an arithmetic number, because the mean of its divisors is an integer number (7663556965393).

Almost surely, 2^{28464640157161} is an apocalyptic number.

It is an amenable number.

28464640157161 is a deficient number, since it is larger than the sum of its proper divisors (2189587704411).

28464640157161 is a wasteful number, since it uses less digits than its factorization.

28464640157161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189587704410.

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 28464640157161 in words is "twenty-eight trillion, four hundred sixty-four billion, six hundred forty million, one hundred fifty-seven thousand, one hundred sixty-one".