128973745215 has 72 divisors (see below), whose sum is σ = 271403964000. Its totient is φ = 55491185664.

The previous prime is 128973745177. The next prime is 128973745217. The reversal of 128973745215 is 512547379821.

128973745215 is a `hidden beast` number, since 1 + 2 + 89 + 7 + 37 + 4 + 521 + 5 = 666.

It is not a de Polignac number, because 128973745215 - 2⁸ = 128973744959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128973745217) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 617340 + ... + 799409.

It is an arithmetic number, because the mean of its divisors is an integer number (3769499500).

Almost surely, 2^128973745215 is an apocalyptic number.

128973745215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128973745215 is an abundant number, since it is smaller than the sum of its proper divisors (142430218785).

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

128973745215 is a wasteful number, since it uses less digits than its factorization.

128973745215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416801 (or 1416781 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 54.

The spelling of 128973745215 in words is "one hundred twenty-eight billion, nine hundred seventy-three million, seven hundred forty-five thousand, two hundred fifteen".