216304554 has 16 divisors (see below), whose sum is σ = 440772192. Its totient is φ = 70741008.

The previous prime is 216304547. The next prime is 216304559. The reversal of 216304554 is 455403612.

216304554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216304554² = 93575320162277832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216304559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339784 + ... + 340419.

It is an arithmetic number, because the mean of its divisors is an integer number (27548262).

Almost surely, 2^216304554 is an apocalyptic number.

216304554 is an abundant number, since it is smaller than the sum of its proper divisors (224467638).

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

216304554 is a wasteful number, since it uses less digits than its factorization.

216304554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680261.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 216304554 is about 14707.2959445304. The cubic root of 216304554 is about 600.2818620134.

The spelling of 216304554 in words is "two hundred sixteen million, three hundred four thousand, five hundred fifty-four".