216468728644 has 81 divisors (see below), whose sum is σ = 445561966143. Its totient is φ = 91753388496.

The previous prime is 216468728629. The next prime is 216468728669. The reversal of 216468728644 is 446827864612.

The square root of 216468728644 is 465262.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1087782457 + ... + 1087782655.

Almost surely, 2^216468728644 is an apocalyptic number.

216468728644 is the 465262-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216468728644

216468728644 is an abundant number, since it is smaller than the sum of its proper divisors (229093237499).

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

216468728644 is an equidigital number, since it uses as much as digits as its factorization.

216468728644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 375 counting only the distinct ones).

The product of its digits is 24772608, while the sum is 58.

The spelling of 216468728644 in words is "two hundred sixteen billion, four hundred sixty-eight million, seven hundred twenty-eight thousand, six hundred forty-four".