28239136272 has 100 divisors (see below), whose sum is σ = 81896633280. Its totient is φ = 9394114752.

The previous prime is 28239136253. The next prime is 28239136273. The reversal of 28239136272 is 27263193282.

28239136272 is a `hidden beast` number, since 2 + 8 + 2 + 3 + 9 + 13 + 627 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (28239136273) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 630229 + ... + 673547.

Almost surely, 2^28239136272 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 28239136272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40948316640).

28239136272 is an abundant number, since it is smaller than the sum of its proper divisors (53657497008).

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

28239136272 is a wasteful number, since it uses less digits than its factorization.

28239136272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43842 (or 43827 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The spelling of 28239136272 in words is "twenty-eight billion, two hundred thirty-nine million, one hundred thirty-six thousand, two hundred seventy-two".