128396707690 has 16 divisors (see below), whose sum is σ = 231118161192. Its totient is φ = 51357774784.

The previous prime is 128396707661. The next prime is 128396707709. The reversal of 128396707690 is 96707693821.

It can be written as a sum of positive squares in 4 ways, for example, as 123395530729 + 5001176961 = 351277^2 + 70719^2 .

It is a super-2 number, since 2×128396707690² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1003632 + ... + 1124308.

Almost surely, 2^128396707690 is an apocalyptic number.

128396707690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128396707690 is a deficient number, since it is larger than the sum of its proper divisors (102721453502).

128396707690 is a wasteful number, since it uses less digits than its factorization.

128396707690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227081.

The product of its (nonzero) digits is 6858432, while the sum is 58.

The spelling of 128396707690 in words is "one hundred twenty-eight billion, three hundred ninety-six million, seven hundred seven thousand, six hundred ninety".