1281382880 has 24 divisors (see below), whose sum is σ = 3027267432. Its totient is φ = 512553088.

The previous prime is 1281382873. The next prime is 1281382889. The reversal of 1281382880 is 882831821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281382889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4004162 + ... + 4004481.

It is an arithmetic number, because the mean of its divisors is an integer number (126136143).

Almost surely, 2^1281382880 is an apocalyptic number.

1281382880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281382880 is an abundant number, since it is smaller than the sum of its proper divisors (1745884552).

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

1281382880 is an equidigital number, since it uses as much as digits as its factorization.

1281382880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008658 (or 8008650 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 41.

The square root of 1281382880 is about 35796.4087584216. The cubic root of 1281382880 is about 1086.1579177669.

The spelling of 1281382880 in words is "one billion, two hundred eighty-one million, three hundred eighty-two thousand, eight hundred eighty".