1216003536 has 240 divisors, whose sum is σ = 3933012160. Its totient is φ = 359251200.

The previous prime is 1216003531. The next prime is 1216003571. The reversal of 1216003536 is 6353006121.

1216003536 is a `hidden beast` number, since 1 + 2 + 1 + 600 + 3 + 53 + 6 = 666.

1216003536 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216003531) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2247426 + ... + 2247966.

Almost surely, 2^1216003536 is an apocalyptic number.

1216003536 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 1216003536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1966506080).

1216003536 is an abundant number, since it is smaller than the sum of its proper divisors (2717008624).

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

1216003536 is a wasteful number, since it uses less digits than its factorization.

1216003536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1216003536 is about 34871.2422491657. The cubic root of 1216003536 is about 1067.3616940786.

Adding to 1216003536 its reverse (6353006121), we get a palindrome (7569009657).

The spelling of 1216003536 in words is "one billion, two hundred sixteen million, three thousand, five hundred thirty-six".