128672837 has 2 divisors, whose sum is σ = 128672838. Its totient is φ = 128672836.

The previous prime is 128672827. The next prime is 128672839. The reversal of 128672837 is 738276821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121198081 + 7474756 = 11009^2 + 2734^2 .

It is a cyclic number.

It is not a de Polignac number, because 128672837 - 2⁴ = 128672821 is a prime.

Together with 128672839, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128672839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64336418 + 64336419.

It is an arithmetic number, because the mean of its divisors is an integer number (64336419).

Almost surely, 2^128672837 is an apocalyptic number.

It is an amenable number.

128672837 is a deficient number, since it is larger than the sum of its proper divisors (1).

128672837 is an equidigital number, since it uses as much as digits as its factorization.

128672837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 44.

The square root of 128672837 is about 11343.4050002634. The cubic root of 128672837 is about 504.8499204388.

The spelling of 128672837 in words is "one hundred twenty-eight million, six hundred seventy-two thousand, eight hundred thirty-seven".