128987197380 has 36 divisors (see below), whose sum is σ = 391261165932. Its totient is φ = 34396585920.

The previous prime is 128987197373. The next prime is 128987197393. The reversal of 128987197380 is 83791789821.

128987197380 is a `hidden beast` number, since 12 + 8 + 98 + 71 + 97 + 380 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 99614721924 + 29372475456 = 315618^2 + 171384^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 358297591 + ... + 358297950.

Almost surely, 2^128987197380 is an apocalyptic number.

128987197380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128987197380 is an abundant number, since it is smaller than the sum of its proper divisors (262273968552).

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

128987197380 is a wasteful number, since it uses less digits than its factorization.

128987197380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716595556 (or 716595551 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 63.

The spelling of 128987197380 in words is "one hundred twenty-eight billion, nine hundred eighty-seven million, one hundred ninety-seven thousand, three hundred eighty".