28615571136 has 196 divisors, whose sum is σ = 86028394872. Its totient is φ = 9438695424.

The previous prime is 28615571087. The next prime is 28615571143. The reversal of 28615571136 is 63117551682.

28615571136 is a `hidden beast` number, since 2 + 8 + 61 + 5 + 571 + 13 + 6 = 666.

It is a super-2 number, since 2×28615571136² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28615571091 and 28615571100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4522471 + ... + 4528793.

It is an arithmetic number, because the mean of its divisors is an integer number (438920382).

Almost surely, 2^28615571136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28615571136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43014197436).

28615571136 is an abundant number, since it is smaller than the sum of its proper divisors (57412823736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28615571136 is an frugal number, since it uses more digits than its factorization.

28615571136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6450 (or 6425 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 28615571136 in words is "twenty-eight billion, six hundred fifteen million, five hundred seventy-one thousand, one hundred thirty-six".