1280721150 has 72 divisors (see below), whose sum is σ = 3505858200. Its totient is φ = 335075520.

The previous prime is 1280721149. The next prime is 1280721161. The reversal of 1280721150 is 511270821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3000 + ... + 50699.

It is an arithmetic number, because the mean of its divisors is an integer number (48692475).

Almost surely, 2^1280721150 is an apocalyptic number.

1280721150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280721150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1752929100).

1280721150 is an abundant number, since it is smaller than the sum of its proper divisors (2225137050).

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

1280721150 is a wasteful number, since it uses less digits than its factorization.

1280721150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53770 (or 53762 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 1280721150 is about 35787.1645984982. The cubic root of 1280721150 is about 1085.9709148423.

Adding to 1280721150 its reverse (511270821), we get a palindrome (1791991971).

The spelling of 1280721150 in words is "one billion, two hundred eighty million, seven hundred twenty-one thousand, one hundred fifty".