1216287360 has 256 divisors, whose sum is σ = 4384368000. Its totient is φ = 318578688.

The previous prime is 1216287353. The next prime is 1216287377. The reversal of 1216287360 is 637826121.

1216287360 is a `hidden beast` number, since 1 + 2 + 16 + 287 + 360 = 666.

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

It is a congruent 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, 1018924 + ... + 1020116.

Almost surely, 2^1216287360 is an apocalyptic number.

1216287360 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 1216287360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2192184000).

1216287360 is an abundant number, since it is smaller than the sum of its proper divisors (3168080640).

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

1216287360 is a wasteful number, since it uses less digits than its factorization.

1216287360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280 (or 1262 counting only the distinct ones).

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

The square root of 1216287360 is about 34875.3116115111. The cubic root of 1216287360 is about 1067.4447309256. Note that the first 3 decimals are identical.

The spelling of 1216287360 in words is "one billion, two hundred sixteen million, two hundred eighty-seven thousand, three hundred sixty".