266331540 has 96 divisors (see below), whose sum is σ = 775756800. Its totient is φ = 68269440.

The previous prime is 266331539. The next prime is 266331547. The reversal of 266331540 is 45133662.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 266331498 and 266331507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266331547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1787386 + ... + 1787534.

It is an arithmetic number, because the mean of its divisors is an integer number (8080800).

Almost surely, 2^266331540 is an apocalyptic number.

266331540 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 266331540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387878400).

266331540 is an abundant number, since it is smaller than the sum of its proper divisors (509425260).

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

266331540 is a wasteful number, since it uses less digits than its factorization.

266331540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 266331540 is about 16319.6672760201. The cubic root of 266331540 is about 643.3898423401.

The spelling of 266331540 in words is "two hundred sixty-six million, three hundred thirty-one thousand, five hundred forty".