215640616 has 16 divisors (see below), whose sum is σ = 404949600. Its totient is φ = 107654064.

The previous prime is 215640589. The next prime is 215640629. The reversal of 215640616 is 616046512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15180 + ... + 25723.

It is an arithmetic number, because the mean of its divisors is an integer number (25309350).

Almost surely, 2^215640616 is an apocalyptic number.

It is an amenable number.

215640616 is a deficient number, since it is larger than the sum of its proper divisors (189308984).

215640616 is a wasteful number, since it uses less digits than its factorization.

215640616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41568 (or 41564 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 215640616 is about 14684.7068748409. The cubic root of 215640616 is about 599.6670523143.

The spelling of 215640616 in words is "two hundred fifteen million, six hundred forty thousand, six hundred sixteen".