216547890 has 32 divisors (see below), whose sum is σ = 559694016. Its totient is φ = 53304000.

The previous prime is 216547879. The next prime is 216547907. The reversal of 216547890 is 98745612.

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

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 15 ways as a sum of consecutive naturals, for example, 277236 + ... + 278015.

It is an arithmetic number, because the mean of its divisors is an integer number (17490438).

Almost surely, 2^216547890 is an apocalyptic number.

216547890 is an abundant number, since it is smaller than the sum of its proper divisors (343146126).

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

216547890 is a wasteful number, since it uses less digits than its factorization.

216547890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555274.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 216547890 is about 14715.5662480246. The cubic root of 216547890 is about 600.5068772274.

The spelling of 216547890 in words is "two hundred sixteen million, five hundred forty-seven thousand, eight hundred ninety".