215968225 has 24 divisors (see below), whose sum is σ = 295873920. Its totient is φ = 155064000.

The previous prime is 215968219. The next prime is 215968253. The reversal of 215968225 is 522869512.

It is not a de Polignac number, because 215968225 - 2³ = 215968217 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 16755 + ... + 26695.

It is an arithmetic number, because the mean of its divisors is an integer number (12328080).

Almost surely, 2^215968225 is an apocalyptic number.

215968225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215968225 is a deficient number, since it is larger than the sum of its proper divisors (79905695).

215968225 is a wasteful number, since it uses less digits than its factorization.

215968225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10041 (or 10036 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The square root of 215968225 is about 14695.8574094879. The cubic root of 215968225 is about 599.9705772609.

The spelling of 215968225 in words is "two hundred fifteen million, nine hundred sixty-eight thousand, two hundred twenty-five".