216471474 has 64 divisors (see below), whose sum is σ = 492687360. Its totient is φ = 70434000.

The previous prime is 216471473. The next prime is 216471517. The reversal of 216471474 is 474174612.

It is a happy number.

216471474 is a `hidden beast` number, since 2 + 1 + 647 + 1 + 4 + 7 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (216471473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 502039 + ... + 502469.

It is an arithmetic number, because the mean of its divisors is an integer number (7698240).

Almost surely, 2^216471474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216471474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246343680).

216471474 is an abundant number, since it is smaller than the sum of its proper divisors (276215886).

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

216471474 is a wasteful number, since it uses less digits than its factorization.

216471474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 638 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 216471474 is about 14712.9695846896. The cubic root of 216471474 is about 600.4362327581.

The spelling of 216471474 in words is "two hundred sixteen million, four hundred seventy-one thousand, four hundred seventy-four".