1216454268 has 48 divisors (see below), whose sum is σ = 2970293760. Its totient is φ = 386743104.

The previous prime is 1216454263. The next prime is 1216454269. The reversal of 1216454268 is 8624546121.

It is a happy number.

It is a super-2 number, since 2×1216454268² = 2959521972270831648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216454263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92946 + ... + 105222.

It is an arithmetic number, because the mean of its divisors is an integer number (61881120).

Almost surely, 2^1216454268 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 1216454268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1485146880).

1216454268 is an abundant number, since it is smaller than the sum of its proper divisors (1753839492).

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

1216454268 is a wasteful number, since it uses less digits than its factorization.

1216454268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12666 (or 12664 counting only the distinct ones).

The product of its digits is 92160, while the sum is 39.

The square root of 1216454268 is about 34877.7044542785. The cubic root of 1216454268 is about 1067.4935562613.

The spelling of 1216454268 in words is "one billion, two hundred sixteen million, four hundred fifty-four thousand, two hundred sixty-eight".