216862520 has 64 divisors (see below), whose sum is σ = 560675520. Its totient is φ = 73949184.

The previous prime is 216862517. The next prime is 216862531. The reversal of 216862520 is 25268612.

216862520 = 5563² + 5564² + ... + 5569².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52034 + ... + 56046.

It is an arithmetic number, because the mean of its divisors is an integer number (8760555).

Almost surely, 2^216862520 is an apocalyptic number.

216862520 is a gapful number since it is divisible by the number (20) 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 216862520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280337760).

216862520 is an abundant number, since it is smaller than the sum of its proper divisors (343813000).

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

216862520 is a wasteful number, since it uses less digits than its factorization.

216862520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224 (or 4220 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 216862520 is about 14726.2527480687. The cubic root of 216862520 is about 600.7975689661.

The spelling of 216862520 in words is "two hundred sixteen million, eight hundred sixty-two thousand, five hundred twenty".