1216464450 has 72 divisors (see below), whose sum is σ = 3124771728. Its totient is φ = 313172160.

The previous prime is 1216464413. The next prime is 1216464451. The reversal of 1216464450 is 544646121.

It is a super-2 number, since 2×1216464450² = 2959571516227605000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1216464451) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 121329 + ... + 130971.

Almost surely, 2^1216464450 is an apocalyptic number.

1216464450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216464450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562385864).

1216464450 is an abundant number, since it is smaller than the sum of its proper divisors (1908307278).

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

1216464450 is a wasteful number, since it uses less digits than its factorization.

1216464450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9716 (or 9682 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 1216464450 is about 34877.8504211484. The cubic root of 1216464450 is about 1067.4965346413.

The spelling of 1216464450 in words is "one billion, two hundred sixteen million, four hundred sixty-four thousand, four hundred fifty".