1287229320 has 384 divisors, whose sum is σ = 4777194240. Its totient is φ = 309795840.

The previous prime is 1287229319. The next prime is 1287229331. The reversal of 1287229320 is 239227821.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7707877 + ... + 7708043.

It is an arithmetic number, because the mean of its divisors is an integer number (12440610).

Almost surely, 2^1287229320 is an apocalyptic number.

1287229320 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 1287229320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2388597120).

1287229320 is an abundant number, since it is smaller than the sum of its proper divisors (3489964920).

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

1287229320 is a wasteful number, since it uses less digits than its factorization.

1287229320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1287229320 is about 35877.9782039066. The cubic root of 1287229320 is about 1087.8073138622.

The spelling of 1287229320 in words is "one billion, two hundred eighty-seven million, two hundred twenty-nine thousand, three hundred twenty".