128927227491 has 12 divisors (see below), whose sum is σ = 186241267680. Its totient is φ = 85945461840.

The previous prime is 128927227487. The next prime is 128927227501. The reversal of 128927227491 is 194722729821.

128927227491 is a `hidden beast` number, since 1 + 2 + 89 + 2 + 72 + 2 + 7 + 491 = 666.

It is not a de Polignac number, because 128927227491 - 2² = 128927227487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128927227391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364380 + ... + 625001.

It is an arithmetic number, because the mean of its divisors is an integer number (15520105640).

Almost surely, 2^128927227491 is an apocalyptic number.

128927227491 is a deficient number, since it is larger than the sum of its proper divisors (57314040189).

128927227491 is a wasteful number, since it uses less digits than its factorization.

128927227491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003866 (or 1003863 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 128927227491 in words is "one hundred twenty-eight billion, nine hundred twenty-seven million, two hundred twenty-seven thousand, four hundred ninety-one".