128726057 has 16 divisors (see below), whose sum is σ = 138885120. Its totient is φ = 118879488.

The previous prime is 128726033. The next prime is 128726063. The reversal of 128726057 is 750627821.

It is a cyclic number.

It is not a de Polignac number, because 128726057 - 2¹⁴ = 128709673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128726057.

It is not an unprimeable number, because it can be changed into a prime (128726557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235058 + ... + 235604.

It is an arithmetic number, because the mean of its divisors is an integer number (8680320).

Almost surely, 2^128726057 is an apocalyptic number.

128726057 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128726057 is a deficient number, since it is larger than the sum of its proper divisors (10159063).

128726057 is a wasteful number, since it uses less digits than its factorization.

128726057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 128726057 is about 11345.7506142168. The cubic root of 128726057 is about 504.9195140167.

The spelling of 128726057 in words is "one hundred twenty-eight million, seven hundred twenty-six thousand, fifty-seven".