1216325448 has 72 divisors (see below), whose sum is σ = 3567143970. Its totient is φ = 374250240.

The previous prime is 1216325443. The next prime is 1216325449. The reversal of 1216325448 is 8445236121.

It is a happy number.

1216325448 is a `hidden beast` number, since 12 + 1 + 632 + 5 + 4 + 4 + 8 = 666.

1216325448 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 462164004 + 754161444 = 21498^2 + 27462^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1216325443) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 37813 + ... + 62148.

Almost surely, 2^1216325448 is an apocalyptic number.

1216325448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1216325448 is an abundant number, since it is smaller than the sum of its proper divisors (2350818522).

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

1216325448 is a wasteful number, since it uses less digits than its factorization.

1216325448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99999 (or 99979 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 1216325448 is about 34875.8576668732. The cubic root of 1216325448 is about 1067.4558731419.

The spelling of 1216325448 in words is "one billion, two hundred sixteen million, three hundred twenty-five thousand, four hundred forty-eight".