1287223056 has 160 divisors (see below), whose sum is σ = 4252108800. Its totient is φ = 365212800.

The previous prime is 1287223043. The next prime is 1287223073. The reversal of 1287223056 is 6503227821.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1287223056.

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, 455215 + ... + 458033.

It is an arithmetic number, because the mean of its divisors is an integer number (26575680).

Almost surely, 2^1287223056 is an apocalyptic number.

1287223056 is a gapful number since it is divisible by the number (16) 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 1287223056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2126054400).

1287223056 is an abundant number, since it is smaller than the sum of its proper divisors (2964885744).

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

1287223056 is a wasteful number, since it uses less digits than its factorization.

1287223056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2994 (or 2982 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 1287223056 is about 35877.8909079115. The cubic root of 1287223056 is about 1087.8055493395.

1287223056 divided by its sum of digits (36) gives a triangular number (35756196 = T₈₄₅₆).

The spelling of 1287223056 in words is "one billion, two hundred eighty-seven million, two hundred twenty-three thousand, fifty-six".