1283040720 has 120 divisors (see below), whose sum is σ = 4640364456. Its totient is φ = 315823104.

The previous prime is 1283040719. The next prime is 1283040743. The reversal of 1283040720 is 270403821.

It can be written as a sum of positive squares in 4 ways, for example, as 60279696 + 1222761024 = 7764^2 + 34968^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59179 + ... + 77898.

Almost surely, 2^1283040720 is an apocalyptic number.

1283040720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1283040720 is an abundant number, since it is smaller than the sum of its proper divisors (3357323736).

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

1283040720 is a wasteful number, since it uses less digits than its factorization.

1283040720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137109 (or 137100 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 1283040720 is about 35819.5577862151. The cubic root of 1283040720 is about 1086.6261358832.

The spelling of 1283040720 in words is "one billion, two hundred eighty-three million, forty thousand, seven hundred twenty".