215999952 has 80 divisors (see below), whose sum is σ = 643470720. Its totient is φ = 61157376.

The previous prime is 215999933. The next prime is 215999989. The reversal of 215999952 is 259999512.

It is a happy number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 215999895 and 215999904.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 35124 + ... + 40812.

It is an arithmetic number, because the mean of its divisors is an integer number (8043384).

Almost surely, 2^215999952 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 215999952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321735360).

215999952 is an abundant number, since it is smaller than the sum of its proper divisors (427470768).

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

215999952 is a wasteful number, since it uses less digits than its factorization.

215999952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5820 (or 5814 counting only the distinct ones).

The product of its digits is 656100, while the sum is 51.

The square root of 215999952 is about 14696.9368237058. The cubic root of 215999952 is about 599.9999555556. Note that the first 4 decimals are identical.

The spelling of 215999952 in words is "two hundred fifteen million, nine hundred ninety-nine thousand, nine hundred fifty-two".