266845140 has 72 divisors (see below), whose sum is σ = 818574120. Its totient is φ = 70354944.

The previous prime is 266845129. The next prime is 266845151. The reversal of 266845140 is 41548662.

266845140 is a `hidden beast` number, since 2 + 66 + 84 + 514 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (266845129) and next prime (266845151).

It can be written as a sum of positive squares in 4 ways, for example, as 65318724 + 201526416 = 8082^2 + 14196^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 266845095 and 266845104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7692 + ... + 24348.

It is an arithmetic number, because the mean of its divisors is an integer number (11369085).

Almost surely, 2^266845140 is an apocalyptic number.

266845140 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 266845140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409287060).

266845140 is an abundant number, since it is smaller than the sum of its proper divisors (551728980).

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

266845140 is a wasteful number, since it uses less digits than its factorization.

266845140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16761 (or 16756 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 266845140 is about 16335.3953120211. The cubic root of 266845140 is about 643.8031528048.

The spelling of 266845140 in words is "two hundred sixty-six million, eight hundred forty-five thousand, one hundred forty".