216872055 has 12 divisors (see below), whose sum is σ = 375911640. Its totient is φ = 115665072.

The previous prime is 216872039. The next prime is 216872069. The reversal of 216872055 is 550278612.

It is a happy number.

It is not a de Polignac number, because 216872055 - 2⁴ = 216872039 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 2409645 + ... + 2409734.

It is an arithmetic number, because the mean of its divisors is an integer number (31325970).

Almost surely, 2^216872055 is an apocalyptic number.

216872055 is a deficient number, since it is larger than the sum of its proper divisors (159039585).

216872055 is a wasteful number, since it uses less digits than its factorization.

216872055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4819390 (or 4819387 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 216872055 is about 14726.5764860676. The cubic root of 216872055 is about 600.8063741158.

The spelling of 216872055 in words is "two hundred sixteen million, eight hundred seventy-two thousand, fifty-five".