1281718720 has 56 divisors (see below), whose sum is σ = 3212744400. Its totient is φ = 485701632.

The previous prime is 1281718693. The next prime is 1281718729. The reversal of 1281718720 is 278171821.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1281718720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281718729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99325 + ... + 111484.

Almost surely, 2^1281718720 is an apocalyptic number.

1281718720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281718720 is an abundant number, since it is smaller than the sum of its proper divisors (1931025680).

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

1281718720 is a wasteful number, since it uses less digits than its factorization.

1281718720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210845 (or 210835 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 37.

The square root of 1281718720 is about 35801.0994244590. The cubic root of 1281718720 is about 1086.2528005214.

The spelling of 1281718720 in words is "one billion, two hundred eighty-one million, seven hundred eighteen thousand, seven hundred twenty".