128472277 has 4 divisors (see below), whose sum is σ = 132616576. Its totient is φ = 124327980.

The previous prime is 128472269. The next prime is 128472287. The reversal of 128472277 is 772274821.

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: 772274821 = 31 ⋅24912091.

It is not a de Polignac number, because 128472277 - 2³ = 128472269 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 (128472257) 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, 2072103 + ... + 2072164.

It is an arithmetic number, because the mean of its divisors is an integer number (33154144).

Almost surely, 2^128472277 is an apocalyptic number.

It is an amenable number.

128472277 is a deficient number, since it is larger than the sum of its proper divisors (4144299).

128472277 is an equidigital number, since it uses as much as digits as its factorization.

128472277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4144298.

The product of its digits is 87808, while the sum is 40.

The square root of 128472277 is about 11334.5611736847. The cubic root of 128472277 is about 504.5874839243.

The spelling of 128472277 in words is "one hundred twenty-eight million, four hundred seventy-two thousand, two hundred seventy-seven".