1216672056 has 32 divisors (see below), whose sum is σ = 3379645200. Its totient is φ = 405557280.

The previous prime is 1216672043. The next prime is 1216672091. The reversal of 1216672056 is 6502766121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1216672056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2816155 + ... + 2816586.

Almost surely, 2^1216672056 is an apocalyptic number.

It is an amenable number.

1216672056 is an abundant number, since it is smaller than the sum of its proper divisors (2162973144).

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

1216672056 is a wasteful number, since it uses less digits than its factorization.

1216672056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632756 (or 5632746 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1216672056 is about 34880.8264810340. The cubic root of 1216672056 is about 1067.5572587283.

The spelling of 1216672056 in words is "one billion, two hundred sixteen million, six hundred seventy-two thousand, fifty-six".