216745430 has 16 divisors (see below), whose sum is σ = 425609424. Its totient is φ = 78816480.

The previous prime is 216745423. The next prime is 216745447. The reversal of 216745430 is 34547612.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

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, 985097 + ... + 985316.

It is an arithmetic number, because the mean of its divisors is an integer number (26600589).

Almost surely, 2^216745430 is an apocalyptic number.

216745430 is a deficient number, since it is larger than the sum of its proper divisors (208863994).

216745430 is a wasteful number, since it uses less digits than its factorization.

216745430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970431.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 216745430 is about 14722.2766581803. The cubic root of 216745430 is about 600.6894204919.

The spelling of 216745430 in words is "two hundred sixteen million, seven hundred forty-five thousand, four hundred thirty".