1216782324 has 60 divisors (see below), whose sum is σ = 3219304704. Its totient is φ = 400698576.

The previous prime is 1216782299. The next prime is 1216782337. The reversal of 1216782324 is 4232876121.

It is a happy number.

1216782324 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 (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4269 + ... + 49515.

Almost surely, 2^1216782324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216782324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609652352).

1216782324 is an abundant number, since it is smaller than the sum of its proper divisors (2002522380).

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

1216782324 is a wasteful number, since it uses less digits than its factorization.

1216782324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45346 (or 45335 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1216782324 is about 34882.4070843742. The cubic root of 1216782324 is about 1067.5895089547.

The spelling of 1216782324 in words is "one billion, two hundred sixteen million, seven hundred eighty-two thousand, three hundred twenty-four".