216255474 has 16 divisors (see below), whose sum is σ = 480567840. Its totient is φ = 72085140.

The previous prime is 216255461. The next prime is 216255539. The reversal of 216255474 is 474552612.

It is a happy number.

216255474 is a `hidden beast` number, since 21 + 625 + 5 + 4 + 7 + 4 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2002312 + ... + 2002419.

It is an arithmetic number, because the mean of its divisors is an integer number (30035490).

Almost surely, 2^216255474 is an apocalyptic number.

216255474 is an abundant number, since it is smaller than the sum of its proper divisors (264312366).

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

216255474 is a wasteful number, since it uses less digits than its factorization.

216255474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004742 (or 4004736 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 216255474 is about 14705.6272902587. The cubic root of 216255474 is about 600.2364568014.

The spelling of 216255474 in words is "two hundred sixteen million, two hundred fifty-five thousand, four hundred seventy-four".