1216748844 has 48 divisors (see below), whose sum is σ = 3160295040. Its totient is φ = 404842320.

The previous prime is 1216748779. The next prime is 1216748849. The reversal of 1216748844 is 4488476121.

1216748844 is a `hidden beast` number, since 1 + 2 + 167 + 488 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1216748844.

It is not an unprimeable number, because it can be changed into a prime (1216748849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50799 + ... + 70809.

It is an arithmetic number, because the mean of its divisors is an integer number (65839480).

Almost surely, 2^1216748844 is an apocalyptic number.

It is an amenable number.

1216748844 is an abundant number, since it is smaller than the sum of its proper divisors (1943546196).

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

1216748844 is a wasteful number, since it uses less digits than its factorization.

1216748844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20587 (or 20579 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 1216748844 is about 34881.9271829984. The cubic root of 1216748844 is about 1067.5797172213.

The spelling of 1216748844 in words is "one billion, two hundred sixteen million, seven hundred forty-eight thousand, eight hundred forty-four".