1266220272 has 80 divisors (see below), whose sum is σ = 3396032640. Its totient is φ = 406054656.

The previous prime is 1266220223. The next prime is 1266220273. The reversal of 1266220272 is 2720226621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266220273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425863 + ... + 428825.

It is an arithmetic number, because the mean of its divisors is an integer number (42450408).

Almost surely, 2^1266220272 is an apocalyptic number.

1266220272 is a gapful number since it is divisible by the number (12) 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 1266220272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1698016320).

1266220272 is an abundant number, since it is smaller than the sum of its proper divisors (2129812368).

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

1266220272 is a wasteful number, since it uses less digits than its factorization.

1266220272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310 (or 3304 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 1266220272 is about 35583.9889838112. The cubic root of 1266220272 is about 1081.8567374780.

Adding to 1266220272 its reverse (2720226621), we get a palindrome (3986446893).

The spelling of 1266220272 in words is "one billion, two hundred sixty-six million, two hundred twenty thousand, two hundred seventy-two".