215798220800 has 108 divisors (see below), whose sum is σ = 535309673535. Its totient is φ = 86277242880.

The previous prime is 215798220773. The next prime is 215798220821. The reversal of 215798220800 is 8022897512.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 81056367616 + 134741853184 = 284704^2 + 367072^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=328480.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 105112574 + ... + 105114626.

Almost surely, 2^215798220800 is an apocalyptic number.

215798220800 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 215798220800

215798220800 is an abundant number, since it is smaller than the sum of its proper divisors (319511452735).

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

215798220800 is an frugal number, since it uses more digits than its factorization.

215798220800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138 (or 2060 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 215798220800 in words is "two hundred fifteen billion, seven hundred ninety-eight million, two hundred twenty thousand, eight hundred".