128640314470689 has 32 divisors (see below), whose sum is σ = 217804236353280. Its totient is φ = 73508572483200.

The previous prime is 128640314470627. The next prime is 128640314470699. The reversal of 128640314470689 is 986074413046821.

128640314470689 is a `hidden beast` number, since 1 + 2 + 8 + 6 + 403 + 144 + 7 + 0 + 6 + 89 = 666.

It is not a de Polignac number, because 128640314470689 - 2⁸ = 128640314470433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (128640314470699) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144887269 + ... + 145772429.

It is an arithmetic number, because the mean of its divisors is an integer number (6806382386040).

Almost surely, 2^{128640314470689} is an apocalyptic number.

It is an amenable number.

128640314470689 is a deficient number, since it is larger than the sum of its proper divisors (89163921882591).

128640314470689 is an equidigital number, since it uses as much as digits as its factorization.

128640314470689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654118 (or 1654112 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 128640314470689 in words is "one hundred twenty-eight trillion, six hundred forty billion, three hundred fourteen million, four hundred seventy thousand, six hundred eighty-nine".