128342677 has 4 divisors (see below), whose sum is σ = 131811436. Its totient is φ = 124873920.

The previous prime is 128342647. The next prime is 128342693. The reversal of 128342677 is 776243821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 776243821 = 73 ⋅10633477.

It can be written as a sum of positive squares in 2 ways, for example, as 101727396 + 26615281 = 10086^2 + 5159^2 .

It is a cyclic number.

It is not a de Polignac number, because 128342677 - 2¹¹ = 128340629 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128342647) 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, 1734324 + ... + 1734397.

It is an arithmetic number, because the mean of its divisors is an integer number (32952859).

Almost surely, 2^128342677 is an apocalyptic number.

It is an amenable number.

128342677 is a deficient number, since it is larger than the sum of its proper divisors (3468759).

128342677 is an equidigital number, since it uses as much as digits as its factorization.

128342677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468758.

The product of its digits is 112896, while the sum is 40.

The square root of 128342677 is about 11328.8427034715. The cubic root of 128342677 is about 504.4177545962.

The spelling of 128342677 in words is "one hundred twenty-eight million, three hundred forty-two thousand, six hundred seventy-seven".