128987243531520 has 216 divisors, whose sum is σ = 452807854530528. Its totient is φ = 31269634682880.

The previous prime is 128987243531519. The next prime is 128987243531539. The reversal of 128987243531520 is 25135342789821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138338782 + ... + 139268061.

Almost surely, 2^{128987243531520} is an apocalyptic number.

128987243531520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128987243531520 is an abundant number, since it is smaller than the sum of its proper divisors (323820610999008).

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

128987243531520 is a wasteful number, since it uses less digits than its factorization.

128987243531520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277606889 (or 277606864 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 60.

The spelling of 128987243531520 in words is "one hundred twenty-eight trillion, nine hundred eighty-seven billion, two hundred forty-three million, five hundred thirty-one thousand, five hundred twenty".