1216353760 has 24 divisors (see below), whose sum is σ = 2873636136. Its totient is φ = 486541440.

The previous prime is 1216353731. The next prime is 1216353767. The reversal of 1216353760 is 673536121.

It is a super-2 number, since 2×1216353760² = 2959032938932275200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216353767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3800946 + ... + 3801265.

It is an arithmetic number, because the mean of its divisors is an integer number (119734839).

Almost surely, 2^1216353760 is an apocalyptic number.

1216353760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216353760 is an abundant number, since it is smaller than the sum of its proper divisors (1657282376).

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

1216353760 is an equidigital number, since it uses as much as digits as its factorization.

1216353760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7602226 (or 7602218 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 1216353760 is about 34876.2635613393. The cubic root of 1216353760 is about 1067.4641553486.

Adding to 1216353760 its reverse (673536121), we get a palindrome (1889889881).

The spelling of 1216353760 in words is "one billion, two hundred sixteen million, three hundred fifty-three thousand, seven hundred sixty".