216006404 has 12 divisors (see below), whose sum is σ = 378142800. Its totient is φ = 107965608.

The previous prime is 216006391. The next prime is 216006433. The reversal of 216006404 is 404600612.

It is a happy number.

It is a super-2 number, since 2×216006404² = 93317533138022432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216006404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6527 + ... + 21785.

It is an arithmetic number, because the mean of its divisors is an integer number (31511900).

Almost surely, 2^216006404 is an apocalyptic number.

It is an amenable number.

216006404 is a deficient number, since it is larger than the sum of its proper divisors (162136396).

216006404 is a wasteful number, since it uses less digits than its factorization.

216006404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18802 (or 18800 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 216006404 is about 14697.1563235886. The cubic root of 216006404 is about 600.0059295710.

The spelling of 216006404 in words is "two hundred sixteen million, six thousand, four hundred four".