266388740 has 24 divisors (see below), whose sum is σ = 588860160. Its totient is φ = 100947168.

The previous prime is 266388701. The next prime is 266388757. The reversal of 266388740 is 47883662.

It is a junction number, because it is equal to n+sod(n) for n = 266388691 and 266388700.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350132 + ... + 350891.

It is an arithmetic number, because the mean of its divisors is an integer number (24535840).

Almost surely, 2^266388740 is an apocalyptic number.

266388740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266388740 is an abundant number, since it is smaller than the sum of its proper divisors (322471420).

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

266388740 is a wasteful number, since it uses less digits than its factorization.

266388740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701051 (or 701049 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 266388740 is about 16321.4196686440. The cubic root of 266388740 is about 643.4358993019.

The spelling of 266388740 in words is "two hundred sixty-six million, three hundred eighty-eight thousand, seven hundred forty".