216378458 has 4 divisors (see below), whose sum is σ = 324567690. Its totient is φ = 108189228.

The previous prime is 216378433. The next prime is 216378467. The reversal of 216378458 is 854873612.

216378458 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 215884249 + 494209 = 14693^2 + 703^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54094613 + ... + 54094616.

Almost surely, 2^216378458 is an apocalyptic number.

216378458 is a deficient number, since it is larger than the sum of its proper divisors (108189232).

216378458 is a wasteful number, since it uses less digits than its factorization.

216378458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108189231.

The product of its digits is 322560, while the sum is 44.

The square root of 216378458 is about 14709.8082244467. The cubic root of 216378458 is about 600.3502196113.

The spelling of 216378458 in words is "two hundred sixteen million, three hundred seventy-eight thousand, four hundred fifty-eight".