128521268 has 12 divisors (see below), whose sum is σ = 225403332. Its totient is φ = 64120320.

The previous prime is 128521259. The next prime is 128521273. The reversal of 128521268 is 862125821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 100240144 + 28281124 = 10012^2 + 5318^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33005 + ... + 36692.

It is an arithmetic number, because the mean of its divisors is an integer number (18783611).

Almost surely, 2^128521268 is an apocalyptic number.

It is an amenable number.

128521268 is a deficient number, since it is larger than the sum of its proper divisors (96882064).

128521268 is a wasteful number, since it uses less digits than its factorization.

128521268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70162 (or 70160 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 128521268 is about 11336.7221012072. The cubic root of 128521268 is about 504.6516147610.

The spelling of 128521268 in words is "one hundred twenty-eight million, five hundred twenty-one thousand, two hundred sixty-eight".