1216542264 has 64 divisors (see below), whose sum is σ = 3478775040. Its totient is φ = 347289600.

The previous prime is 1216542227. The next prime is 1216542319. The reversal of 1216542264 is 4622456121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266707 + ... + 271229.

It is an arithmetic number, because the mean of its divisors is an integer number (54355860).

Almost surely, 2^1216542264 is an apocalyptic number.

1216542264 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1216542264 is an abundant number, since it is smaller than the sum of its proper divisors (2262232776).

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

1216542264 is a wasteful number, since it uses less digits than its factorization.

1216542264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6140 (or 6136 counting only the distinct ones).

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

The square root of 1216542264 is about 34878.9659250385. The cubic root of 1216542264 is about 1067.5192957954.

Adding to 1216542264 its reverse (4622456121), we get a palindrome (5838998385).

The spelling of 1216542264 in words is "one billion, two hundred sixteen million, five hundred forty-two thousand, two hundred sixty-four".