266123928 has 64 divisors (see below), whose sum is σ = 766402560. Its totient is φ = 75430656.

The previous prime is 266123911. The next prime is 266123939. The reversal of 266123928 is 829321662.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15100 + ... + 27572.

It is an arithmetic number, because the mean of its divisors is an integer number (11975040).

Almost surely, 2^266123928 is an apocalyptic number.

266123928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266123928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383201280).

266123928 is an abundant number, since it is smaller than the sum of its proper divisors (500278632).

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

266123928 is a wasteful number, since it uses less digits than its factorization.

266123928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12616 (or 12612 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 266123928 is about 16313.3052444929. The cubic root of 266123928 is about 643.2226194676. Note that the first 3 decimals are identical.

The spelling of 266123928 in words is "two hundred sixty-six million, one hundred twenty-three thousand, nine hundred twenty-eight".