1216301688 has 48 divisors (see below), whose sum is σ = 3764744880. Its totient is φ = 347514624.

The previous prime is 1216301687. The next prime is 1216301711. The reversal of 1216301688 is 8861036121.

1216301688 is a `hidden beast` number, since 1 + 2 + 1 + 630 + 16 + 8 + 8 = 666.

1216301688 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216301687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1206145 + ... + 1207152.

It is an arithmetic number, because the mean of its divisors is an integer number (78432185).

Almost surely, 2^1216301688 is an apocalyptic number.

1216301688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1216301688 is an abundant number, since it is smaller than the sum of its proper divisors (2548443192).

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

1216301688 is a wasteful number, since it uses less digits than its factorization.

1216301688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413316 (or 2413309 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1216301688 is about 34875.5170284255. The cubic root of 1216301688 is about 1067.4489224483.

The spelling of 1216301688 in words is "one billion, two hundred sixteen million, three hundred one thousand, six hundred eighty-eight".