216326404 has 24 divisors (see below), whose sum is σ = 433641600. Its totient is φ = 92499456.

The previous prime is 216326389. The next prime is 216326437. The reversal of 216326404 is 404623612.

It is a super-2 number, since 2×216326404² = 93594226135142432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3969 + ... + 21175.

It is an arithmetic number, because the mean of its divisors is an integer number (18068400).

Almost surely, 2^216326404 is an apocalyptic number.

It is an amenable number.

216326404 is an abundant number, since it is smaller than the sum of its proper divisors (217315196).

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

216326404 is a wasteful number, since it uses less digits than its factorization.

216326404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17667 (or 17665 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 216326404 is about 14708.0387543683. The cubic root of 216326404 is about 600.3020738194.

The spelling of 216326404 in words is "two hundred sixteen million, three hundred twenty-six thousand, four hundred four".