128987197452 has 36 divisors (see below), whose sum is σ = 327596255896. Its totient is φ = 42791958720.

The previous prime is 128987197439. The next prime is 128987197453. The reversal of 128987197452 is 254791789821.

128987197452 is a `hidden beast` number, since 1 + 2 + 8 + 98 + 7 + 1 + 97 + 452 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 128987197452.

It is not an unprimeable number, because it can be changed into a prime (128987197453) 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, 8482873 + ... + 8498064.

Almost surely, 2^128987197452 is an apocalyptic number.

128987197452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128987197452 is an abundant number, since it is smaller than the sum of its proper divisors (198609058444).

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

128987197452 is a wasteful number, since it uses less digits than its factorization.

128987197452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16981158 (or 16981153 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 128987197452 in words is "one hundred twenty-eight billion, nine hundred eighty-seven million, one hundred ninety-seven thousand, four hundred fifty-two".