1216036800 has 420 divisors, whose sum is σ = 4881911496. Its totient is φ = 294451200.

The previous prime is 1216036793. The next prime is 1216036807. The reversal of 1216036800 is 86306121.

It is an interprime number because it is at equal distance from previous prime (1216036793) and next prime (1216036807).

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 (1216036807) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1425174 + ... + 1426026.

Almost surely, 2^1216036800 is an apocalyptic number.

1216036800 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 1216036800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2440955748).

1216036800 is an abundant number, since it is smaller than the sum of its proper divisors (3665874696).

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

1216036800 is a wasteful number, since it uses less digits than its factorization.

1216036800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 874 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1216036800 is about 34871.7192005212. The cubic root of 1216036800 is about 1067.3714266149.

The spelling of 1216036800 in words is "one billion, two hundred sixteen million, thirty-six thousand, eight hundred".