216332987 has 4 divisors (see below), whose sum is σ = 232974000. Its totient is φ = 199691976.

The previous prime is 216332983. The next prime is 216333037. The reversal of 216332987 is 789233612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216332987 - 2² = 216332983 is a prime.

It is a super-2 number, since 2×216332987² = 93599922528684338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216332981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8320487 + ... + 8320512.

It is an arithmetic number, because the mean of its divisors is an integer number (58243500).

Almost surely, 2^216332987 is an apocalyptic number.

216332987 is a deficient number, since it is larger than the sum of its proper divisors (16641013).

216332987 is a wasteful number, since it uses less digits than its factorization.

216332987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16641012.

The product of its digits is 108864, while the sum is 41.

The square root of 216332987 is about 14708.2625418504. The cubic root of 216332987 is about 600.3081629951.

The spelling of 216332987 in words is "two hundred sixteen million, three hundred thirty-two thousand, nine hundred eighty-seven".