266381604 has 72 divisors (see below), whose sum is σ = 691399800. Its totient is φ = 86441472.

The previous prime is 266381593. The next prime is 266381623. The reversal of 266381604 is 406183662.

266381604 is a `hidden beast` number, since 2 + 6 + 638 + 16 + 0 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 39204 + 266342400 = 198^2 + 16320^2 .

It is a super-2 number, since 2×266381604² = 141918317899225632, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 283824 + ... + 284760.

It is an arithmetic number, because the mean of its divisors is an integer number (9602775).

Almost surely, 2^266381604 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 266381604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345699900).

266381604 is an abundant number, since it is smaller than the sum of its proper divisors (425018196).

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

266381604 is a wasteful number, since it uses less digits than its factorization.

266381604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 266381604 is about 16321.2010587456. The cubic root of 266381604 is about 643.4301538143.

The spelling of 266381604 in words is "two hundred sixty-six million, three hundred eighty-one thousand, six hundred four".