1216610304 has 304 divisors, whose sum is σ = 4227850368. Its totient is φ = 301989888.

The previous prime is 1216610293. The next prime is 1216610363. The reversal of 1216610304 is 4030166121.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71565304 + ... + 71565320.

Almost surely, 2^1216610304 is an apocalyptic number.

1216610304 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 1216610304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2113925184).

1216610304 is an abundant number, since it is smaller than the sum of its proper divisors (3011240064).

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

1216610304 is an frugal number, since it uses more digits than its factorization.

1216610304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1216610304 is about 34879.9412843542. The cubic root of 1216610304 is about 1067.5391971888.

Adding to 1216610304 its reverse (4030166121), we get a palindrome (5246776425).

The spelling of 1216610304 in words is "one billion, two hundred sixteen million, six hundred ten thousand, three hundred four".