216774684 has 192 divisors, whose sum is σ = 690923520. Its totient is φ = 57369600.

The previous prime is 216774683. The next prime is 216774697. The reversal of 216774684 is 486477612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216774683) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1297969 + ... + 1298135.

It is an arithmetic number, because the mean of its divisors is an integer number (3598560).

Almost surely, 2^216774684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216774684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345461760).

216774684 is an abundant number, since it is smaller than the sum of its proper divisors (474148836).

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

216774684 is a wasteful number, since it uses less digits than its factorization.

216774684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 297 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 216774684 is about 14723.2701530604. The cubic root of 216774684 is about 600.7164441724.

The spelling of 216774684 in words is "two hundred sixteen million, seven hundred seventy-four thousand, six hundred eighty-four".