216692987 has 8 divisors (see below), whose sum is σ = 247754976. Its totient is φ = 185657472.

The previous prime is 216692977. The next prime is 216693011. The reversal of 216692987 is 789296612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216692987 - 2¹⁰ = 216691963 is a prime.

It is a super-2 number, since 2×216692987² = 93911701229964338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216692947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16163 + ... + 26355.

It is an arithmetic number, because the mean of its divisors is an integer number (30969372).

Almost surely, 2^216692987 is an apocalyptic number.

216692987 is a deficient number, since it is larger than the sum of its proper divisors (31061989).

216692987 is a wasteful number, since it uses less digits than its factorization.

216692987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13237.

The product of its digits is 653184, while the sum is 50.

The square root of 216692987 is about 14720.4954739981. The cubic root of 216692987 is about 600.6409696490.

The spelling of 216692987 in words is "two hundred sixteen million, six hundred ninety-two thousand, nine hundred eighty-seven".