216687156 has 48 divisors (see below), whose sum is σ = 578841984. Its totient is φ = 61802496.

The previous prime is 216687139. The next prime is 216687169. The reversal of 216687156 is 651786612.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 54616 + ... + 58448.

It is an arithmetic number, because the mean of its divisors is an integer number (12059208).

Almost surely, 2^216687156 is an apocalyptic number.

It is an amenable number.

216687156 is an abundant number, since it is smaller than the sum of its proper divisors (362154828).

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

216687156 is a wasteful number, since it uses less digits than its factorization.

216687156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4520 (or 4518 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 216687156 is about 14720.2974154736. The cubic root of 216687156 is about 600.6355820436.

The spelling of 216687156 in words is "two hundred sixteen million, six hundred eighty-seven thousand, one hundred fifty-six".