216623869 has 32 divisors (see below), whose sum is σ = 281594880. Its totient is φ = 161750400.

The previous prime is 216623861. The next prime is 216623917. The reversal of 216623869 is 968326612.

It is not a de Polignac number, because 216623869 - 2³ = 216623861 is a prime.

It is a super-2 number, since 2×216623869² = 93851801241058322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216623861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185682 + ... + 186844.

It is an arithmetic number, because the mean of its divisors is an integer number (8799840).

Almost surely, 2^216623869 is an apocalyptic number.

It is an amenable number.

216623869 is a deficient number, since it is larger than the sum of its proper divisors (64971011).

216623869 is a wasteful number, since it uses less digits than its factorization.

216623869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281.

The product of its digits is 186624, while the sum is 43.

The square root of 216623869 is about 14718.1476076305. The cubic root of 216623869 is about 600.5771012271.

The spelling of 216623869 in words is "two hundred sixteen million, six hundred twenty-three thousand, eight hundred sixty-nine".