28911420432 has 60 divisors (see below), whose sum is σ = 82238270764. Its totient is φ = 9479151360.

The previous prime is 28911420407. The next prime is 28911420449. The reversal of 28911420432 is 23402411982.

28911420432 is a `hidden beast` number, since 2 + 89 + 1 + 142 + 0 + 432 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 655155216 + 28256265216 = 25596^2 + 168096^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1636903 + ... + 1654470.

Almost surely, 2^28911420432 is an apocalyptic number.

It is an amenable number.

28911420432 is an abundant number, since it is smaller than the sum of its proper divisors (53326850332).

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

28911420432 is a wasteful number, since it uses less digits than its factorization.

28911420432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3291448 (or 3291439 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 28911420432 in words is "twenty-eight billion, nine hundred eleven million, four hundred twenty thousand, four hundred thirty-two".