1287087280 has 40 divisors (see below), whose sum is σ = 3095672400. Its totient is φ = 497081088.

The previous prime is 1287087239. The next prime is 1287087281. The reversal of 1287087280 is 827807821.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1287087281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275070 + ... + 279709.

It is an arithmetic number, because the mean of its divisors is an integer number (77391810).

Almost surely, 2^1287087280 is an apocalyptic number.

1287087280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287087280 is an abundant number, since it is smaller than the sum of its proper divisors (1808585120).

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

1287087280 is a wasteful number, since it uses less digits than its factorization.

1287087280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554821 (or 554815 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 43.

The square root of 1287087280 is about 35875.9986620582. The cubic root of 1287087280 is about 1087.7673008327.

The spelling of 1287087280 in words is "one billion, two hundred eighty-seven million, eighty-seven thousand, two hundred eighty".