216464386 has 4 divisors (see below), whose sum is σ = 324696582. Its totient is φ = 108232192.

The previous prime is 216464377. The next prime is 216464407. The reversal of 216464386 is 683464612.

216464386 is digitally balanced in base 2, 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., 204347025 + 12117361 = 14295^2 + 3481^2 .

It is a super-3 number, since 3×216464386³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54116095 + ... + 54116098.

Almost surely, 2^216464386 is an apocalyptic number.

216464386 is a deficient number, since it is larger than the sum of its proper divisors (108232196).

216464386 is a wasteful number, since it uses less digits than its factorization.

216464386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108232195.

The product of its digits is 165888, while the sum is 40.

The square root of 216464386 is about 14712.7287068035. The cubic root of 216464386 is about 600.4296792565.

The spelling of 216464386 in words is "two hundred sixteen million, four hundred sixty-four thousand, three hundred eighty-six".