216526404 has 12 divisors (see below), whose sum is σ = 505228304. Its totient is φ = 72175464.

The previous prime is 216526403. The next prime is 216526417. The reversal of 216526404 is 404625612.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (216526403) 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, 9021922 + ... + 9021945.

Almost surely, 2^216526404 is an apocalyptic number.

It is an amenable number.

216526404 is an abundant number, since it is smaller than the sum of its proper divisors (288701900).

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

216526404 is a wasteful number, since it uses less digits than its factorization.

216526404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18043874 (or 18043872 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 216526404 is about 14714.8361866519. The cubic root of 216526404 is about 600.4870156970.

The spelling of 216526404 in words is "two hundred sixteen million, five hundred twenty-six thousand, four hundred four".