1216996704 has 288 divisors, whose sum is σ = 4461649920. Its totient is φ = 315912960.

The previous prime is 1216996691. The next prime is 1216996733. The reversal of 1216996704 is 4076996121.

It is a tau number, because it is divible by the number of its divisors (288).

It is a self number, because there is not a number n which added to its sum of digits gives 1216996704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 730977 + ... + 732639.

It is an arithmetic number, because the mean of its divisors is an integer number (15491840).

Almost surely, 2^1216996704 is an apocalyptic number.

1216996704 is a gapful number since it is divisible by the number (14) 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 1216996704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2230824960).

1216996704 is an abundant number, since it is smaller than the sum of its proper divisors (3244653216).

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

1216996704 is a wasteful number, since it uses less digits than its factorization.

1216996704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1216996704 is about 34885.4798447721. The cubic root of 1216996704 is about 1067.6522033782.

The spelling of 1216996704 in words is "one billion, two hundred sixteen million, nine hundred ninety-six thousand, seven hundred four".