216773886 has 64 divisors (see below), whose sum is σ = 514031616. Its totient is φ = 59637600.

The previous prime is 216773881. The next prime is 216773899. The reversal of 216773886 is 688377612.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216773881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 430711 + ... + 431213.

It is an arithmetic number, because the mean of its divisors is an integer number (8031744).

Almost surely, 2^216773886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216773886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257015808).

216773886 is an abundant number, since it is smaller than the sum of its proper divisors (297257730).

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

216773886 is a wasteful number, since it uses less digits than its factorization.

216773886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877.

The product of its digits is 677376, while the sum is 48.

The square root of 216773886 is about 14723.2430530777. The cubic root of 216773886 is about 600.7157070440.

The spelling of 216773886 in words is "two hundred sixteen million, seven hundred seventy-three thousand, eight hundred eighty-six".