1288381660 has 12 divisors (see below), whose sum is σ = 2705601528. Its totient is φ = 515352656.

The previous prime is 1288381657. The next prime is 1288381673. The reversal of 1288381660 is 661838821.

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, 32209522 + ... + 32209561.

It is an arithmetic number, because the mean of its divisors is an integer number (225466794).

Almost surely, 2^1288381660 is an apocalyptic number.

1288381660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1288381660 is an abundant number, since it is smaller than the sum of its proper divisors (1417219868).

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

1288381660 is a wasteful number, since it uses less digits than its factorization.

1288381660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64419092 (or 64419090 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 1288381660 is about 35894.0337660732. The cubic root of 1288381660 is about 1088.1318222180.

The spelling of 1288381660 in words is "one billion, two hundred eighty-eight million, three hundred eighty-one thousand, six hundred sixty".