128998897564 has 12 divisors (see below), whose sum is σ = 225927387000. Its totient is φ = 64448215568.

The previous prime is 128998897561. The next prime is 128998897607. The reversal of 128998897564 is 465798899821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128998897561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12802639 + ... + 12812710.

It is an arithmetic number, because the mean of its divisors is an integer number (18827282250).

Almost surely, 2^128998897564 is an apocalyptic number.

It is an amenable number.

128998897564 is a deficient number, since it is larger than the sum of its proper divisors (96928489436).

128998897564 is a wasteful number, since it uses less digits than its factorization.

128998897564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25616612 (or 25616610 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 76.

The spelling of 128998897564 in words is "one hundred twenty-eight billion, nine hundred ninety-eight million, eight hundred ninety-seven thousand, five hundred sixty-four".