1216974720 has 128 divisors (see below), whose sum is σ = 4177585440. Its totient is φ = 299556864.

The previous prime is 1216974679. The next prime is 1216974739. The reversal of 1216974720 is 274796121.

1216974720 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 582 + ... + 49338.

Almost surely, 2^1216974720 is an apocalyptic number.

1216974720 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 1216974720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088792720).

1216974720 is an abundant number, since it is smaller than the sum of its proper divisors (2960610720).

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

1216974720 is a wasteful number, since it uses less digits than its factorization.

1216974720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48792 (or 48780 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 1216974720 is about 34885.1647552366. The cubic root of 1216974720 is about 1067.6457745996.

The spelling of 1216974720 in words is "one billion, two hundred sixteen million, nine hundred seventy-four thousand, seven hundred twenty".