215961272 has 16 divisors (see below), whose sum is σ = 405088560. Its totient is φ = 107937664.

The previous prime is 215961253. The next prime is 215961313. The reversal of 215961272 is 272169512.

215961272 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 3 ways as a sum of consecutive naturals, for example, 28688 + ... + 35424.

It is an arithmetic number, because the mean of its divisors is an integer number (25318035).

Almost surely, 2^215961272 is an apocalyptic number.

It is an amenable number.

215961272 is a deficient number, since it is larger than the sum of its proper divisors (189127288).

215961272 is a wasteful number, since it uses less digits than its factorization.

215961272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10750 (or 10746 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 215961272 is about 14695.6208443196. The cubic root of 215961272 is about 599.9641385974.

The spelling of 215961272 in words is "two hundred fifteen million, nine hundred sixty-one thousand, two hundred seventy-two".