266436240 has 320 divisors, whose sum is σ = 1054218240. Its totient is φ = 54190080.

The previous prime is 266436229. The next prime is 266436319. The reversal of 266436240 is 42634662.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 542395 + ... + 542885.

It is an arithmetic number, because the mean of its divisors is an integer number (3294432).

Almost surely, 2^266436240 is an apocalyptic number.

266436240 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 266436240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (527109120).

266436240 is an abundant number, since it is smaller than the sum of its proper divisors (787782000).

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

266436240 is a wasteful number, since it uses less digits than its factorization.

266436240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 266436240 is about 16322.8747468085. The cubic root of 266436240 is about 643.4741408942.

The spelling of 266436240 in words is "two hundred sixty-six million, four hundred thirty-six thousand, two hundred forty".