1266241620 has 96 divisors (see below), whose sum is σ = 4057417728. Its totient is φ = 289037952.

The previous prime is 1266241591. The next prime is 1266241633. The reversal of 1266241620 is 261426621.

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 31 ways as a sum of consecutive naturals, for example, 411327 + ... + 414393.

It is an arithmetic number, because the mean of its divisors is an integer number (42264768).

Almost surely, 2^1266241620 is an apocalyptic number.

1266241620 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 1266241620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2028708864).

1266241620 is an abundant number, since it is smaller than the sum of its proper divisors (2791176108).

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

1266241620 is a wasteful number, since it uses less digits than its factorization.

1266241620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069 (or 4067 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1266241620 is about 35584.2889489168. The cubic root of 1266241620 is about 1081.8628173438.

The spelling of 1266241620 in words is "one billion, two hundred sixty-six million, two hundred forty-one thousand, six hundred twenty".