266721600 has 168 divisors, whose sum is σ = 882769888. Its totient is φ = 70502400.

The previous prime is 266721589. The next prime is 266721643. The reversal of 266721600 is 6127662.

It is a super-2 number, since 2×266721600² = 142280823813120000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 868647 + ... + 868953.

Almost surely, 2^266721600 is an apocalyptic number.

266721600 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 266721600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (441384944).

266721600 is an abundant number, since it is smaller than the sum of its proper divisors (616048288).

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

266721600 is a wasteful number, since it uses less digits than its factorization.

266721600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 266721600 is about 16331.6135148980. The cubic root of 266721600 is about 643.7037846610.

The spelling of 266721600 in words is "two hundred sixty-six million, seven hundred twenty-one thousand, six hundred".