1287689280 has 224 divisors, whose sum is σ = 4336450560. Its totient is φ = 322836480.

The previous prime is 1287689257. The next prime is 1287689297. The reversal of 1287689280 is 829867821.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4140325 + ... + 4140635.

Almost surely, 2^1287689280 is an apocalyptic number.

1287689280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287689280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2168225280).

1287689280 is an abundant number, since it is smaller than the sum of its proper divisors (3048761280).

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

1287689280 is a wasteful number, since it uses less digits than its factorization.

1287689280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 51.

The square root of 1287689280 is about 35884.3876915853. The cubic root of 1287689280 is about 1087.9368655695.

The spelling of 1287689280 in words is "one billion, two hundred eighty-seven million, six hundred eighty-nine thousand, two hundred eighty".