1266520320 has 288 divisors, whose sum is σ = 4841827200. Its totient is φ = 311648256.

The previous prime is 1266520319. The next prime is 1266520331. The reversal of 1266520320 is 230256621.

1266520320 is a `hidden beast` number, since 1 + 2 + 6 + 652 + 0 + 3 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (27).

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 31 ways as a sum of consecutive naturals, for example, 447871 + ... + 450689.

It is an arithmetic number, because the mean of its divisors is an integer number (16811900).

Almost surely, 2^1266520320 is an apocalyptic number.

1266520320 is a gapful number since it is divisible by the number (10) 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 1266520320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2420913600).

1266520320 is an abundant number, since it is smaller than the sum of its proper divisors (3575306880).

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

1266520320 is a wasteful number, since it uses less digits than its factorization.

1266520320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2862 (or 2842 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1266520320 is about 35588.2047875416. The cubic root of 1266520320 is about 1081.9421842523.

Adding to 1266520320 its reverse (230256621), we get a palindrome (1496776941).

The spelling of 1266520320 in words is "one billion, two hundred sixty-six million, five hundred twenty thousand, three hundred twenty".