215055400 has 48 divisors (see below), whose sum is σ = 571436640. Its totient is φ = 73732800.

The previous prime is 215055377. The next prime is 215055443. The reversal of 215055400 is 4550512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75406 + ... + 78205.

It is an arithmetic number, because the mean of its divisors is an integer number (11904930).

Almost surely, 2^215055400 is an apocalyptic number.

215055400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215055400 is an abundant number, since it is smaller than the sum of its proper divisors (356381240).

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

215055400 is a wasteful number, since it uses less digits than its factorization.

215055400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153634 (or 153625 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 215055400 is about 14664.7673012564. The cubic root of 215055400 is about 599.1240923021.

The spelling of 215055400 in words is "two hundred fifteen million, fifty-five thousand, four hundred".