128591832420 has 96 divisors (see below), whose sum is σ = 421119484800. Its totient is φ = 32486355072.

The previous prime is 128591832407. The next prime is 128591832469. The reversal of 128591832420 is 24238195821.

128591832420 is a `hidden beast` number, since 1 + 2 + 8 + 591 + 8 + 32 + 4 + 20 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6256399 + ... + 6276918.

It is an arithmetic number, because the mean of its divisors is an integer number (4386661300).

Almost surely, 2^128591832420 is an apocalyptic number.

128591832420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128591832420 is an abundant number, since it is smaller than the sum of its proper divisors (292527652380).

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

128591832420 is a wasteful number, since it uses less digits than its factorization.

128591832420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12533354 (or 12533346 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 128591832420 in words is "one hundred twenty-eight billion, five hundred ninety-one million, eight hundred thirty-two thousand, four hundred twenty".