216339756 has 48 divisors (see below), whose sum is σ = 535973760. Its totient is φ = 67682560.

The previous prime is 216339737. The next prime is 216339791. The reversal of 216339756 is 657933612.

It is a super-2 number, since 2×216339756² = 93605780052279072, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84211 + ... + 86741.

It is an arithmetic number, because the mean of its divisors is an integer number (11166120).

Almost surely, 2^216339756 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 216339756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267986880).

216339756 is an abundant number, since it is smaller than the sum of its proper divisors (319634004).

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

216339756 is a wasteful number, since it uses less digits than its factorization.

216339756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2974 (or 2972 counting only the distinct ones).

The product of its digits is 204120, while the sum is 42.

The square root of 216339756 is about 14708.4926488067. The cubic root of 216339756 is about 600.3144240893.

The spelling of 216339756 in words is "two hundred sixteen million, three hundred thirty-nine thousand, seven hundred fifty-six".