216862787 has 4 divisors (see below), whose sum is σ = 218570496. Its totient is φ = 215155080.

The previous prime is 216862781. The next prime is 216862801. The reversal of 216862787 is 787268612.

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 216862787 - 2⁸ = 216862531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216862781) 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, 853664 + ... + 853917.

It is an arithmetic number, because the mean of its divisors is an integer number (54642624).

Almost surely, 2^216862787 is an apocalyptic number.

216862787 is a deficient number, since it is larger than the sum of its proper divisors (1707709).

216862787 is a wasteful number, since it uses less digits than its factorization.

216862787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707708.

The product of its digits is 451584, while the sum is 47.

The square root of 216862787 is about 14726.2618135085. The cubic root of 216862787 is about 600.7978155323.

The spelling of 216862787 in words is "two hundred sixteen million, eight hundred sixty-two thousand, seven hundred eighty-seven".