216881826 has 32 divisors (see below), whose sum is σ = 496222848. Its totient is φ = 61904640.

The previous prime is 216881813. The next prime is 216881857. The reversal of 216881826 is 628188612.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55786 + ... + 59546.

It is an arithmetic number, because the mean of its divisors is an integer number (15506964).

Almost surely, 2^216881826 is an apocalyptic number.

216881826 is an abundant number, since it is smaller than the sum of its proper divisors (279341022).

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

216881826 is a wasteful number, since it uses less digits than its factorization.

216881826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5146.

The product of its digits is 73728, while the sum is 42.

The square root of 216881826 is about 14726.9082294961. The cubic root of 216881826 is about 600.8153969333.

The spelling of 216881826 in words is "two hundred sixteen million, eight hundred eighty-one thousand, eight hundred twenty-six".