128449677 has 4 divisors (see below), whose sum is σ = 171266240. Its totient is φ = 85633116.

The previous prime is 128449669. The next prime is 128449723. The reversal of 128449677 is 776944821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 776944821 = 3 ⋅258981607.

It is not a de Polignac number, because 128449677 - 2³ = 128449669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128449577) 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, 21408277 + ... + 21408282.

It is an arithmetic number, because the mean of its divisors is an integer number (42816560).

Almost surely, 2^128449677 is an apocalyptic number.

It is an amenable number.

128449677 is a deficient number, since it is larger than the sum of its proper divisors (42816563).

128449677 is an equidigital number, since it uses as much as digits as its factorization.

128449677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42816562.

The product of its digits is 677376, while the sum is 48.

The square root of 128449677 is about 11333.5641790215. The cubic root of 128449677 is about 504.5578942827.

The spelling of 128449677 in words is "one hundred twenty-eight million, four hundred forty-nine thousand, six hundred seventy-seven".