215555080 has 128 divisors (see below), whose sum is σ = 555206400. Its totient is φ = 74714112.

The previous prime is 215555051. The next prime is 215555111. The reversal of 215555080 is 80555512.

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 31 ways as a sum of consecutive naturals, for example, 801186 + ... + 801454.

It is an arithmetic number, because the mean of its divisors is an integer number (4337550).

Almost surely, 2^215555080 is an apocalyptic number.

215555080 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 215555080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277603200).

215555080 is an abundant number, since it is smaller than the sum of its proper divisors (339651320).

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

215555080 is a wasteful number, since it uses less digits than its factorization.

215555080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 215555080 is about 14681.7941682888. The cubic root of 215555080 is about 599.5877538571.

The spelling of 215555080 in words is "two hundred fifteen million, five hundred fifty-five thousand, eighty".