1216089264 has 40 divisors (see below), whose sum is σ = 3383224432. Its totient is φ = 374181120.

The previous prime is 1216089253. The next prime is 1216089269. The reversal of 1216089264 is 4629806121.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1216089269) 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, 973807 + ... + 975054.

Almost surely, 2^1216089264 is an apocalyptic number.

It is an amenable number.

1216089264 is an abundant number, since it is smaller than the sum of its proper divisors (2167135168).

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

1216089264 is a wasteful number, since it uses less digits than its factorization.

1216089264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948885 (or 1948879 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1216089264 is about 34872.4714352166. The cubic root of 1216089264 is about 1067.3867764160.

The spelling of 1216089264 in words is "one billion, two hundred sixteen million, eighty-nine thousand, two hundred sixty-four".