128655757 has 4 divisors (see below), whose sum is σ = 128690140. Its totient is φ = 128621376.

The previous prime is 128655733. The next prime is 128655781. The reversal of 128655757 is 757556821.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (128655733) and next prime (128655781).

It can be written as a sum of positive squares in 2 ways, for example, as 40182921 + 88472836 = 6339^2 + 9406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128655757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128655157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10782 + ... + 19327.

It is an arithmetic number, because the mean of its divisors is an integer number (32172535).

Almost surely, 2^128655757 is an apocalyptic number.

It is an amenable number.

128655757 is a deficient number, since it is larger than the sum of its proper divisors (34383).

128655757 is an equidigital number, since it uses as much as digits as its factorization.

128655757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34382.

The product of its digits is 588000, while the sum is 46.

The square root of 128655757 is about 11342.6521149156. The cubic root of 128655757 is about 504.8275815666.

The spelling of 128655757 in words is "one hundred twenty-eight million, six hundred fifty-five thousand, seven hundred fifty-seven".