215880000 has 280 divisors, whose sum is σ = 818887872. Its totient is φ = 49152000.

The previous prime is 215879981. The next prime is 215880013. The reversal of 215880000 is 88512.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 839872 + ... + 840128.

Almost surely, 2^215880000 is an apocalyptic number.

215880000 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 215880000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409443936).

215880000 is an abundant number, since it is smaller than the sum of its proper divisors (603007872).

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

215880000 is an equidigital number, since it uses as much as digits as its factorization.

215880000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 215880000 is about 14692.8554066254. The cubic root of 215880000 is about 599.8888683064. Note that the first 4 decimals are identical.

The spelling of 215880000 in words is "two hundred fifteen million, eight hundred eighty thousand".