266391380 has 24 divisors (see below), whose sum is σ = 562554720. Its totient is φ = 105959840.

The previous prime is 266391371. The next prime is 266391383. The reversal of 266391380 is 83193662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266391383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33626 + ... + 40785.

It is an arithmetic number, because the mean of its divisors is an integer number (23439780).

Almost surely, 2^266391380 is an apocalyptic number.

266391380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266391380 is an abundant number, since it is smaller than the sum of its proper divisors (296163340).

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

266391380 is a wasteful number, since it uses less digits than its factorization.

266391380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74599 (or 74597 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 266391380 is about 16321.5005437613. The cubic root of 266391380 is about 643.4380248486.

The spelling of 266391380 in words is "two hundred sixty-six million, three hundred ninety-one thousand, three hundred eighty".