216057639 has 16 divisors (see below), whose sum is σ = 330125312. Its totient is φ = 123126048.

The previous prime is 216057629. The next prime is 216057643. The reversal of 216057639 is 936750612.

216057639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216057639 - 2⁴ = 216057623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216057597 and 216057606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216057619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5959 + ... + 21624.

It is an arithmetic number, because the mean of its divisors is an integer number (20632832).

Almost surely, 2^216057639 is an apocalyptic number.

216057639 is a deficient number, since it is larger than the sum of its proper divisors (114067673).

216057639 is a wasteful number, since it uses less digits than its factorization.

216057639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27966.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 216057639 is about 14698.8992445013. The cubic root of 216057639 is about 600.0533646980.

The spelling of 216057639 in words is "two hundred sixteen million, fifty-seven thousand, six hundred thirty-nine".