216538476 has 96 divisors (see below), whose sum is σ = 651732480. Its totient is φ = 54297600.

The previous prime is 216538457. The next prime is 216538477. The reversal of 216538476 is 674835612.

216538476 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (216538477) 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, 22756 + ... + 30836.

It is an arithmetic number, because the mean of its divisors is an integer number (6788880).

Almost surely, 2^216538476 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 216538476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325866240).

216538476 is an abundant number, since it is smaller than the sum of its proper divisors (435194004).

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

216538476 is a wasteful number, since it uses less digits than its factorization.

216538476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8135 (or 8133 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 216538476 is about 14715.2463791810. The cubic root of 216538476 is about 600.4981751436.

The spelling of 216538476 in words is "two hundred sixteen million, five hundred thirty-eight thousand, four hundred seventy-six".