266326620 has 96 divisors (see below), whose sum is σ = 859127808. Its totient is φ = 60383232.

The previous prime is 266326603. The next prime is 266326631. The reversal of 266326620 is 26623662.

266326620 = T₁₅₄ + T₁₅₅ + ... + T₁₁₆₉.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50844 + ... + 55836.

It is an arithmetic number, because the mean of its divisors is an integer number (8949248).

Almost surely, 2^266326620 is an apocalyptic number.

266326620 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 266326620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (429563904).

266326620 is an abundant number, since it is smaller than the sum of its proper divisors (592801188).

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

266326620 is a wasteful number, since it uses less digits than its factorization.

266326620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139 (or 5137 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 266326620 is about 16319.5165369566. The cubic root of 266326620 is about 643.3858804893.

The spelling of 266326620 in words is "two hundred sixty-six million, three hundred twenty-six thousand, six hundred twenty".