216255372 has 12 divisors (see below), whose sum is σ = 504595896. Its totient is φ = 72085120.

The previous prime is 216255353. The next prime is 216255373. The reversal of 216255372 is 273552612.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (216255373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9010629 + ... + 9010652.

It is an arithmetic number, because the mean of its divisors is an integer number (42049658).

Almost surely, 2^216255372 is an apocalyptic number.

It is an amenable number.

216255372 is an abundant number, since it is smaller than the sum of its proper divisors (288340524).

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

216255372 is a wasteful number, since it uses less digits than its factorization.

216255372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18021288 (or 18021286 counting only the distinct ones).

The product of its digits is 25200, while the sum is 33.

The square root of 216255372 is about 14705.6238221981. The cubic root of 216255372 is about 600.2363624313.

The spelling of 216255372 in words is "two hundred sixteen million, two hundred fifty-five thousand, three hundred seventy-two".