216842004 has 36 divisors (see below), whose sum is σ = 580372884. Its totient is φ = 68028672.

The previous prime is 216841969. The next prime is 216842011. The reversal of 216842004 is 400248612.

It can be written as a sum of positive squares in 2 ways, for example, as 185504400 + 31337604 = 13620^2 + 5598^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176547 + ... + 177770.

It is an arithmetic number, because the mean of its divisors is an integer number (16121469).

Almost surely, 2^216842004 is an apocalyptic number.

It is an amenable number.

216842004 is an abundant number, since it is smaller than the sum of its proper divisors (363530880).

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

216842004 is a wasteful number, since it uses less digits than its factorization.

216842004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354344 (or 354339 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 216842004 is about 14725.5561524854. The cubic root of 216842004 is about 600.7786224747.

The spelling of 216842004 in words is "two hundred sixteen million, eight hundred forty-two thousand, four".