128277428 has 24 divisors (see below), whose sum is σ = 230342112. Its totient is φ = 62473824.

The previous prime is 128277421. The next prime is 128277433. The reversal of 128277428 is 824772821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128277421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79526 + ... + 81122.

It is an arithmetic number, because the mean of its divisors is an integer number (9597588).

Almost surely, 2^128277428 is an apocalyptic number.

It is an amenable number.

128277428 is a deficient number, since it is larger than the sum of its proper divisors (102064684).

128277428 is a wasteful number, since it uses less digits than its factorization.

128277428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111 (or 2109 counting only the distinct ones).

The product of its digits is 100352, while the sum is 41.

The square root of 128277428 is about 11325.9625639501. The cubic root of 128277428 is about 504.3322586567.

The spelling of 128277428 in words is "one hundred twenty-eight million, two hundred seventy-seven thousand, four hundred twenty-eight".