1216432648 has 32 divisors (see below), whose sum is σ = 2381924160. Its totient is φ = 581296320.

The previous prime is 1216432643. The next prime is 1216432663. The reversal of 1216432648 is 8462346121.

It is not an unprimeable number, because it can be changed into a prime (1216432643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341758 + ... + 345298.

It is an arithmetic number, because the mean of its divisors is an integer number (74435130).

Almost surely, 2^1216432648 is an apocalyptic number.

It is an amenable number.

1216432648 is a deficient number, since it is larger than the sum of its proper divisors (1165491512).

1216432648 is a wasteful number, since it uses less digits than its factorization.

1216432648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5437 (or 5433 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 1216432648 is about 34877.3945127786. The cubic root of 1216432648 is about 1067.4872320484.

Adding to 1216432648 its reverse (8462346121), we get a palindrome (9678778769).

The spelling of 1216432648 in words is "one billion, two hundred sixteen million, four hundred thirty-two thousand, six hundred forty-eight".