28320612131 has 16 divisors (see below), whose sum is σ = 32908197888. Its totient is φ = 23870263200.

The previous prime is 28320612107. The next prime is 28320612167. The reversal of 28320612131 is 13121602382.

It is a happy number.

It is not a de Polignac number, because 28320612131 - 2¹⁴ = 28320595747 is a prime.

It is a super-2 number, since 2×28320612131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28320612094 and 28320612103.

It is not an unprimeable number, because it can be changed into a prime (28320612031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115961 + ... + 264741.

It is an arithmetic number, because the mean of its divisors is an integer number (2056762368).

Almost surely, 2^28320612131 is an apocalyptic number.

28320612131 is a deficient number, since it is larger than the sum of its proper divisors (4587585757).

28320612131 is a wasteful number, since it uses less digits than its factorization.

28320612131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149242.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 28320612131 in words is "twenty-eight billion, three hundred twenty million, six hundred twelve thousand, one hundred thirty-one".