216720699384 has 96 divisors (see below), whose sum is σ = 632066274000. Its totient is φ = 61742661120.

The previous prime is 216720699367. The next prime is 216720699401. The reversal of 216720699384 is 483996027612.

It is an interprime number because it is at equal distance from previous prime (216720699367) and next prime (216720699401).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146404 + ... + 674444.

Almost surely, 2^216720699384 is an apocalyptic number.

216720699384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216720699384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316033137000).

216720699384 is an abundant number, since it is smaller than the sum of its proper divisors (415345574616).

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

216720699384 is a wasteful number, since it uses less digits than its factorization.

216720699384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528413 (or 528402 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 216720699384 in words is "two hundred sixteen billion, seven hundred twenty million, six hundred ninety-nine thousand, three hundred eighty-four".