1216441264 has 20 divisors (see below), whose sum is σ = 2373815080. Its totient is φ = 603843840.

The previous prime is 1216441253. The next prime is 1216441297. The reversal of 1216441264 is 4621446121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271257 + ... + 275704.

It is an arithmetic number, because the mean of its divisors is an integer number (118690754).

Almost surely, 2^1216441264 is an apocalyptic number.

It is an amenable number.

1216441264 is a deficient number, since it is larger than the sum of its proper divisors (1157373816).

1216441264 is a wasteful number, since it uses less digits than its factorization.

1216441264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547108 (or 547102 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 1216441264 is about 34877.5180309609. The cubic root of 1216441264 is about 1067.4897523820.

Adding to 1216441264 its reverse (4621446121), we get a palindrome (5837887385).

The spelling of 1216441264 in words is "one billion, two hundred sixteen million, four hundred forty-one thousand, two hundred sixty-four".