216206540 has 48 divisors (see below), whose sum is σ = 508715424. Its totient is φ = 76492800.

The previous prime is 216206539. The next prime is 216206569. The reversal of 216206540 is 45602612.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5141 + ... + 21420.

It is an arithmetic number, because the mean of its divisors is an integer number (10598238).

Almost surely, 2^216206540 is an apocalyptic number.

216206540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216206540 is an abundant number, since it is smaller than the sum of its proper divisors (292508884).

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

216206540 is a wasteful number, since it uses less digits than its factorization.

216206540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26618 (or 26616 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 216206540 is about 14703.9634112711. The cubic root of 216206540 is about 600.1911798181.

The spelling of 216206540 in words is "two hundred sixteen million, two hundred six thousand, five hundred forty".