128278276 has 27 divisors (see below), whose sum is σ = 261461109. Its totient is φ = 54908448.

The previous prime is 128278273. The next prime is 128278307. The reversal of 128278276 is 672872821.

The square root of 128278276 is 11326.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 112911876 + 15366400 = 10626^2 + 3920^2 .

It is not an unprimeable number, because it can be changed into a prime (128278273) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 158160 + ... + 158968.

Almost surely, 2^128278276 is an apocalyptic number.

128278276 is the 11326-th square number.

It is an amenable number.

128278276 is an abundant number, since it is smaller than the sum of its proper divisors (133182833).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128278276 is an frugal number, since it uses more digits than its factorization.

128278276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 818 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The cubic root of 128278276 is about 504.3333699793. Note that the first 4 decimals are identical.

The spelling of 128278276 in words is "one hundred twenty-eight million, two hundred seventy-eight thousand, two hundred seventy-six".