216724520 has 32 divisors (see below), whose sum is σ = 498009600. Its totient is φ = 84844608.

The previous prime is 216724499. The next prime is 216724553. The reversal of 216724520 is 25427612.

It is a happy number.

216724520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55760 + ... + 59519.

It is an arithmetic number, because the mean of its divisors is an integer number (15562800).

Almost surely, 2^216724520 is an apocalyptic number.

216724520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216724520 is an abundant number, since it is smaller than the sum of its proper divisors (281285080).

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

216724520 is a wasteful number, since it uses less digits than its factorization.

216724520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115337 (or 115333 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 216724520 is about 14721.5664927344. The cubic root of 216724520 is about 600.6701031761.

The spelling of 216724520 in words is "two hundred sixteen million, seven hundred twenty-four thousand, five hundred twenty".