216424705 has 32 divisors (see below), whose sum is σ = 320246784. Its totient is φ = 137020416.

The previous prime is 216424699. The next prime is 216424711. The reversal of 216424705 is 507424612.

It is an interprime number because it is at equal distance from previous prime (216424699) and next prime (216424711).

It is a cyclic number.

It is not a de Polignac number, because 216424705 - 2³ = 216424697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28104 + ... + 34966.

It is an arithmetic number, because the mean of its divisors is an integer number (10007712).

Almost surely, 2^216424705 is an apocalyptic number.

It is an amenable number.

216424705 is a deficient number, since it is larger than the sum of its proper divisors (103822079).

216424705 is a wasteful number, since it uses less digits than its factorization.

216424705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6945.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 216424705 is about 14711.3801188060. The cubic root of 216424705 is about 600.3929879150.

The spelling of 216424705 in words is "two hundred sixteen million, four hundred twenty-four thousand, seven hundred five".