216723740 has 12 divisors (see below), whose sum is σ = 455119896. Its totient is φ = 86689488.

The previous prime is 216723739. The next prime is 216723743. The reversal of 216723740 is 47327612.

It is a junction number, because it is equal to n+sod(n) for n = 216723697 and 216723706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216723743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5418074 + ... + 5418113.

It is an arithmetic number, because the mean of its divisors is an integer number (37926658).

Almost surely, 2^216723740 is an apocalyptic number.

216723740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216723740 is an abundant number, since it is smaller than the sum of its proper divisors (238396156).

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

216723740 is a wasteful number, since it uses less digits than its factorization.

216723740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836196 (or 10836194 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 216723740 is about 14721.5400009646. The cubic root of 216723740 is about 600.6693825636.

The spelling of 216723740 in words is "two hundred sixteen million, seven hundred twenty-three thousand, seven hundred forty".