216757984 has 48 divisors (see below), whose sum is σ = 438939648. Its totient is φ = 105315712.

The previous prime is 216757963. The next prime is 216757991. The reversal of 216757984 is 489757612.

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, 250737 + ... + 251599.

It is an arithmetic number, because the mean of its divisors is an integer number (9144576).

Almost surely, 2^216757984 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 216757984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219469824).

216757984 is an abundant number, since it is smaller than the sum of its proper divisors (222181664).

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

216757984 is a wasteful number, since it uses less digits than its factorization.

216757984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087 (or 1079 counting only the distinct ones).

The product of its digits is 846720, while the sum is 49.

The square root of 216757984 is about 14722.7030126944. The cubic root of 216757984 is about 600.7010176751.

The spelling of 216757984 in words is "two hundred sixteen million, seven hundred fifty-seven thousand, nine hundred eighty-four".