216550404 has 54 divisors (see below), whose sum is σ = 636766494. Its totient is φ = 61871040.

The previous prime is 216550387. The next prime is 216550493. The reversal of 216550404 is 404055612.

216550404 is a `hidden beast` number, since 2 + 1 + 655 + 0 + 4 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 158760000 + 57790404 = 12600^2 + 7602^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 59617 + ... + 63144.

Almost surely, 2^216550404 is an apocalyptic number.

It is an amenable number.

216550404 is an abundant number, since it is smaller than the sum of its proper divisors (420216090).

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

216550404 is a wasteful number, since it uses less digits than its factorization.

216550404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122785 (or 122773 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 216550404 is about 14715.6516675273. The cubic root of 216550404 is about 600.5092010682.

The spelling of 216550404 in words is "two hundred sixteen million, five hundred fifty thousand, four hundred four".