1288720613 has 8 divisors (see below), whose sum is σ = 1351582848. Its totient is φ = 1226427664.

The previous prime is 1288720607. The next prime is 1288720661. The reversal of 1288720613 is 3160278821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1288720613 - 2¹⁶ = 1288655077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288720663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137681 + ... + 146742.

It is an arithmetic number, because the mean of its divisors is an integer number (168947856).

Almost surely, 2^1288720613 is an apocalyptic number.

It is an amenable number.

1288720613 is a deficient number, since it is larger than the sum of its proper divisors (62862235).

1288720613 is a wasteful number, since it uses less digits than its factorization.

1288720613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284643.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 1288720613 is about 35898.7550341234. The cubic root of 1288720613 is about 1088.2272373209.

The spelling of 1288720613 in words is "one billion, two hundred eighty-eight million, seven hundred twenty thousand, six hundred thirteen".