266001840 has 160 divisors (see below), whose sum is σ = 986811840. Its totient is φ = 65470464.

The previous prime is 266001829. The next prime is 266001899. The reversal of 266001840 is 48100662.

266001840 is a `hidden beast` number, since 2 + 6 + 600 + 18 + 40 = 666.

266001840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23344 + ... + 32816.

It is an arithmetic number, because the mean of its divisors is an integer number (6167574).

Almost surely, 2^266001840 is an apocalyptic number.

266001840 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 266001840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493405920).

266001840 is an abundant number, since it is smaller than the sum of its proper divisors (720810000).

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

266001840 is a wasteful number, since it uses less digits than its factorization.

266001840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9508 (or 9496 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 266001840 is about 16309.5628390218. The cubic root of 266001840 is about 643.1242420241.

The spelling of 266001840 in words is "two hundred sixty-six million, one thousand, eight hundred forty".