216191604 has 24 divisors (see below), whose sum is σ = 506067520. Its totient is φ = 71832384.

The previous prime is 216191603. The next prime is 216191609. The reversal of 216191604 is 406191612.

It is a happy number.

216191604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216191603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25024 + ... + 32535.

Almost surely, 2^216191604 is an apocalyptic number.

It is an amenable number.

216191604 is an abundant number, since it is smaller than the sum of its proper divisors (289875916).

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

216191604 is a wasteful number, since it uses less digits than its factorization.

216191604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57879 (or 57877 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 216191604 is about 14703.4555122257. The cubic root of 216191604 is about 600.1773586791.

The spelling of 216191604 in words is "two hundred sixteen million, one hundred ninety-one thousand, six hundred four".