1280241666 has 64 divisors (see below), whose sum is σ = 3175856640. Its totient is φ = 378922320.

The previous prime is 1280241653. The next prime is 1280241667. The reversal of 1280241666 is 6661420821.

It is a self number, because there is not a number n which added to its sum of digits gives 1280241666.

It is not an unprimeable number, because it can be changed into a prime (1280241667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 481 + ... + 50603.

It is an arithmetic number, because the mean of its divisors is an integer number (49622760).

Almost surely, 2^1280241666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280241666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1587928320).

1280241666 is an abundant number, since it is smaller than the sum of its proper divisors (1895614974).

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

1280241666 is a wasteful number, since it uses less digits than its factorization.

1280241666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50188 (or 50182 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1280241666 is about 35780.4648656219. The cubic root of 1280241666 is about 1085.8353738430.

The spelling of 1280241666 in words is "one billion, two hundred eighty million, two hundred forty-one thousand, six hundred sixty-six".