1288044640 has 24 divisors (see below), whose sum is σ = 3043005840. Its totient is φ = 515217792.

The previous prime is 1288044623. The next prime is 1288044673. The reversal of 1288044640 is 464408821.

It is a self number, because there is not a number n which added to its sum of digits gives 1288044640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4024980 + ... + 4025299.

It is an arithmetic number, because the mean of its divisors is an integer number (126791910).

Almost surely, 2^1288044640 is an apocalyptic number.

1288044640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1288044640 is an abundant number, since it is smaller than the sum of its proper divisors (1754961200).

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

1288044640 is an equidigital number, since it uses as much as digits as its factorization.

1288044640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8050294 (or 8050286 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 37.

The square root of 1288044640 is about 35889.3388069493. The cubic root of 1288044640 is about 1088.0369346602.

The spelling of 1288044640 in words is "one billion, two hundred eighty-eight million, forty-four thousand, six hundred forty".