128061657 has 12 divisors (see below), whose sum is σ = 186616404. Its totient is φ = 84618240.

The previous prime is 128061649. The next prime is 128061667. The reversal of 128061657 is 756160821.

It can be written as a sum of positive squares in 2 ways, for example, as 1971216 + 126090441 = 1404^2 + 11229^2 .

It is not a de Polignac number, because 128061657 - 2³ = 128061649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128061617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61944 + ... + 63977.

It is an arithmetic number, because the mean of its divisors is an integer number (15551367).

Almost surely, 2^128061657 is an apocalyptic number.

It is an amenable number.

128061657 is a deficient number, since it is larger than the sum of its proper divisors (58554747).

128061657 is a wasteful number, since it uses less digits than its factorization.

128061657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126040 (or 126037 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 128061657 is about 11316.4330510987. The cubic root of 128061657 is about 504.0493267104.

The spelling of 128061657 in words is "one hundred twenty-eight million, sixty-one thousand, six hundred fifty-seven".