216361660 has 24 divisors (see below), whose sum is σ = 454688640. Its totient is φ = 86481984.

The previous prime is 216361657. The next prime is 216361687. The reversal of 216361660 is 66163612.

It is a congruent number.

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, 32757 + ... + 38803.

It is an arithmetic number, because the mean of its divisors is an integer number (18945360).

Almost surely, 2^216361660 is an apocalyptic number.

216361660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216361660 is an abundant number, since it is smaller than the sum of its proper divisors (238326980).

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

216361660 is a wasteful number, since it uses less digits than its factorization.

216361660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7845 (or 7843 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 216361660 is about 14709.2372337929. The cubic root of 216361660 is about 600.3346836471.

The spelling of 216361660 in words is "two hundred sixteen million, three hundred sixty-one thousand, six hundred sixty".