28131778162 has 16 divisors (see below), whose sum is σ = 42835838400. Its totient is φ = 13853247408.

The previous prime is 28131778159. The next prime is 28131778163. The reversal of 28131778162 is 26187713182.

It is not an unprimeable number, because it can be changed into a prime (28131778163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 787464 + ... + 822412.

It is an arithmetic number, because the mean of its divisors is an integer number (2677239900).

Almost surely, 2^28131778162 is an apocalyptic number.

28131778162 is a deficient number, since it is larger than the sum of its proper divisors (14704060238).

28131778162 is a wasteful number, since it uses less digits than its factorization.

28131778162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41025.

The product of its digits is 225792, while the sum is 46.

The spelling of 28131778162 in words is "twenty-eight billion, one hundred thirty-one million, seven hundred seventy-eight thousand, one hundred sixty-two".