128988637 has 2 divisors, whose sum is σ = 128988638. Its totient is φ = 128988636.

The previous prime is 128988631. The next prime is 128988661. The reversal of 128988637 is 736889821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119661721 + 9326916 = 10939^2 + 3054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128988637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128988631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64494318 + 64494319.

It is an arithmetic number, because the mean of its divisors is an integer number (64494319).

Almost surely, 2^128988637 is an apocalyptic number.

It is an amenable number.

128988637 is a deficient number, since it is larger than the sum of its proper divisors (1).

128988637 is an equidigital number, since it uses as much as digits as its factorization.

128988637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The square root of 128988637 is about 11357.3164524019. The cubic root of 128988637 is about 505.2625984519.

The spelling of 128988637 in words is "one hundred twenty-eight million, nine hundred eighty-eight thousand, six hundred thirty-seven".