216815004 has 108 divisors (see below), whose sum is σ = 671197800. Its totient is φ = 58677696.

The previous prime is 216814993. The next prime is 216815033. The reversal of 216815004 is 400518612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 30282 + ... + 36750.

Almost surely, 2^216815004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216815004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335598900).

216815004 is an abundant number, since it is smaller than the sum of its proper divisors (454382796).

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

216815004 is a wasteful number, since it uses less digits than its factorization.

216815004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6512 (or 6500 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 216815004 is about 14724.6393504221. The cubic root of 216815004 is about 600.7536861988.

The spelling of 216815004 in words is "two hundred sixteen million, eight hundred fifteen thousand, four".