266689128 has 16 divisors (see below), whose sum is σ = 666722880. Its totient is φ = 88896368.

The previous prime is 266689109. The next prime is 266689169. The reversal of 266689128 is 821986662.

It is a happy number.

It is a super-2 number, since 2×266689128² = 142246181986800768, which contains 22 as substring.

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, 5556000 + ... + 5556047.

It is an arithmetic number, because the mean of its divisors is an integer number (41670180).

Almost surely, 2^266689128 is an apocalyptic number.

It is an amenable number.

266689128 is an abundant number, since it is smaller than the sum of its proper divisors (400033752).

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

266689128 is a wasteful number, since it uses less digits than its factorization.

266689128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11112056 (or 11112052 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 266689128 is about 16330.6193391433. The cubic root of 266689128 is about 643.6776610455.

The spelling of 266689128 in words is "two hundred sixty-six million, six hundred eighty-nine thousand, one hundred twenty-eight".