216880490 has 8 divisors (see below), whose sum is σ = 390384900. Its totient is φ = 86752192.

The previous prime is 216880471. The next prime is 216880507. The reversal of 216880490 is 94088612.

It can be written as a sum of positive squares in 2 ways, for example, as 195748081 + 21132409 = 13991^2 + 4597^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10844015 + ... + 10844034.

Almost surely, 2^216880490 is an apocalyptic number.

216880490 is a deficient number, since it is larger than the sum of its proper divisors (173504410).

216880490 is a wasteful number, since it uses less digits than its factorization.

216880490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21688056.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 216880490 is about 14726.8628702789. The cubic root of 216880490 is about 600.8141632492.

The spelling of 216880490 in words is "two hundred sixteen million, eight hundred eighty thousand, four hundred ninety".