216580734 has 48 divisors (see below), whose sum is σ = 495331200. Its totient is φ = 68203728.

The previous prime is 216580717. The next prime is 216580757. The reversal of 216580734 is 437085612.

216580734 is a `hidden beast` number, since 2 + 1 + 6 + 580 + 73 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171397 + ... + 172655.

It is an arithmetic number, because the mean of its divisors is an integer number (10319400).

Almost surely, 2^216580734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216580734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247665600).

216580734 is an abundant number, since it is smaller than the sum of its proper divisors (278750466).

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

216580734 is a wasteful number, since it uses less digits than its factorization.

216580734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 216580734 is about 14716.6821668473. The cubic root of 216580734 is about 600.5372354865.

The spelling of 216580734 in words is "two hundred sixteen million, five hundred eighty thousand, seven hundred thirty-four".