128501266 has 16 divisors (see below), whose sum is σ = 204478560. Its totient is φ = 60356160.

The previous prime is 128501251. The next prime is 128501273. The reversal of 128501266 is 662105821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16105 + ... + 22723.

It is an arithmetic number, because the mean of its divisors is an integer number (12779910).

Almost surely, 2^128501266 is an apocalyptic number.

128501266 is a deficient number, since it is larger than the sum of its proper divisors (75977294).

128501266 is a wasteful number, since it uses less digits than its factorization.

128501266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7209.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 128501266 is about 11335.8398894833. The cubic root of 128501266 is about 504.6254334515.

The spelling of 128501266 in words is "one hundred twenty-eight million, five hundred one thousand, two hundred sixty-six".