215640016 has 10 divisors (see below), whose sum is σ = 417802562. Its totient is φ = 107820000.

The previous prime is 215640011. The next prime is 215640037. The reversal of 215640016 is 610046512.

215640016 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 156350016 + 59290000 = 12504^2 + 7700^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215640011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6738735 + ... + 6738766.

Almost surely, 2^215640016 is an apocalyptic number.

It is an amenable number.

215640016 is a deficient number, since it is larger than the sum of its proper divisors (202162546).

215640016 is a wasteful number, since it uses less digits than its factorization.

215640016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13477509 (or 13477503 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 215640016 is about 14684.6864454097. The cubic root of 215640016 is about 599.6664961411. Note that the first 3 decimals are identical.

Adding to 215640016 its reverse (610046512), we get a palindrome (825686528).

The spelling of 215640016 in words is "two hundred fifteen million, six hundred forty thousand, sixteen".