216912490 has 8 divisors (see below), whose sum is σ = 390442500. Its totient is φ = 86764992.

The previous prime is 216912481. The next prime is 216912539. The reversal of 216912490 is 94219612.

It can be written as a sum of positive squares in 2 ways, for example, as 196868961 + 20043529 = 14031^2 + 4477^2 .

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

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, 10845615 + ... + 10845634.

Almost surely, 2^216912490 is an apocalyptic number.

216912490 is a deficient number, since it is larger than the sum of its proper divisors (173530010).

216912490 is a wasteful number, since it uses less digits than its factorization.

216912490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21691256.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 216912490 is about 14727.9492801951. The cubic root of 216912490 is about 600.8437111778.

The spelling of 216912490 in words is "two hundred sixteen million, nine hundred twelve thousand, four hundred ninety".