266621404 has 48 divisors (see below), whose sum is σ = 572419008. Its totient is φ = 106057728.

The previous prime is 266621363. The next prime is 266621417. The reversal of 266621404 is 404126662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30912 + ... + 38584.

It is an arithmetic number, because the mean of its divisors is an integer number (11925396).

Almost surely, 2^266621404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266621404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286209504).

266621404 is an abundant number, since it is smaller than the sum of its proper divisors (305797604).

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

266621404 is a wasteful number, since it uses less digits than its factorization.

266621404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7774 (or 7772 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 266621404 is about 16328.5456792698. The cubic root of 266621404 is about 643.6231704896.

The spelling of 266621404 in words is "two hundred sixty-six million, six hundred twenty-one thousand, four hundred four".