128260637 has 2 divisors, whose sum is σ = 128260638. Its totient is φ = 128260636.

The previous prime is 128260619. The next prime is 128260661. The reversal of 128260637 is 736062821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124970041 + 3290596 = 11179^2 + 1814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128260637 is a prime.

It is a Chen prime.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 128260597 and 128260606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128260667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64130318 + 64130319.

It is an arithmetic number, because the mean of its divisors is an integer number (64130319).

Almost surely, 2^128260637 is an apocalyptic number.

It is an amenable number.

128260637 is a deficient number, since it is larger than the sum of its proper divisors (1).

128260637 is an equidigital number, since it uses as much as digits as its factorization.

128260637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 128260637 is about 11325.2212781914. The cubic root of 128260637 is about 504.3102526743.

The spelling of 128260637 in words is "one hundred twenty-eight million, two hundred sixty thousand, six hundred thirty-seven".