1280856472 has 48 divisors (see below), whose sum is σ = 2833114320. Its totient is φ = 541195200.

The previous prime is 1280856439. The next prime is 1280856503. The reversal of 1280856472 is 2746580821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4822 + ... + 50842.

It is an arithmetic number, because the mean of its divisors is an integer number (59023215).

Almost surely, 2^1280856472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280856472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1416557160).

1280856472 is an abundant number, since it is smaller than the sum of its proper divisors (1552257848).

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

1280856472 is a wasteful number, since it uses less digits than its factorization.

1280856472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46112 (or 46101 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 1280856472 is about 35789.0551984821. The cubic root of 1280856472 is about 1086.0091616744.

The spelling of 1280856472 in words is "one billion, two hundred eighty million, eight hundred fifty-six thousand, four hundred seventy-two".