128762891625 has 16 divisors (see below), whose sum is σ = 214261452288. Its totient is φ = 68673542000.

The previous prime is 128762891623. The next prime is 128762891629. The reversal of 128762891625 is 526198267821.

It is not a de Polignac number, because 128762891625 - 2¹ = 128762891623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128762891623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171683481 + ... + 171684230.

It is an arithmetic number, because the mean of its divisors is an integer number (13391340768).

Almost surely, 2^128762891625 is an apocalyptic number.

128762891625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128762891625 is a deficient number, since it is larger than the sum of its proper divisors (85498560663).

128762891625 is an equidigital number, since it uses as much as digits as its factorization.

128762891625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343367729 (or 343367719 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 57.

The spelling of 128762891625 in words is "one hundred twenty-eight billion, seven hundred sixty-two million, eight hundred ninety-one thousand, six hundred twenty-five".