266823840 has 192 divisors, whose sum is σ = 937319040. Its totient is φ = 63406080.

The previous prime is 266823839. The next prime is 266823847. The reversal of 266823840 is 48328662.

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 not an unprimeable number, because it can be changed into a prime (266823847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154180 + ... + 155900.

It is an arithmetic number, because the mean of its divisors is an integer number (4881870).

Almost surely, 2^266823840 is an apocalyptic number.

266823840 is a gapful number since it is divisible by the number (20) 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 266823840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (468659520).

266823840 is an abundant number, since it is smaller than the sum of its proper divisors (670495200).

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

266823840 is a wasteful number, since it uses less digits than its factorization.

266823840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 266823840 is about 16334.7433404997. The cubic root of 266823840 is about 643.7860225546.

The spelling of 266823840 in words is "two hundred sixty-six million, eight hundred twenty-three thousand, eight hundred forty".