1281382720 has 56 divisors (see below), whose sum is σ = 3054973824. Its totient is φ = 511934976.

The previous prime is 1281382699. The next prime is 1281382741. The reversal of 1281382720 is 272831821.

It is an interprime number because it is at equal distance from previous prime (1281382699) and next prime (1281382741).

It is a super-2 number, since 2×1281382720² = 3283883350229196800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338277 + ... + 342043.

It is an arithmetic number, because the mean of its divisors is an integer number (54553104).

Almost surely, 2^1281382720 is an apocalyptic number.

1281382720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281382720 is an abundant number, since it is smaller than the sum of its proper divisors (1773591104).

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

1281382720 is a wasteful number, since it uses less digits than its factorization.

1281382720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847 (or 4837 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1281382720 is about 35796.4065235604. The cubic root of 1281382720 is about 1086.1578725592.

The spelling of 1281382720 in words is "one billion, two hundred eighty-one million, three hundred eighty-two thousand, seven hundred twenty".