215928645 has 16 divisors (see below), whose sum is σ = 365808960. Its totient is φ = 108387584.

The previous prime is 215928617. The next prime is 215928653. The reversal of 215928645 is 546829512.

It is a cyclic number.

It is not a de Polignac number, because 215928645 - 2⁹ = 215928133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215928597 and 215928606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423135 + ... + 423644.

It is an arithmetic number, because the mean of its divisors is an integer number (22863060).

Almost surely, 2^215928645 is an apocalyptic number.

It is an amenable number.

215928645 is a deficient number, since it is larger than the sum of its proper divisors (149880315).

215928645 is a wasteful number, since it uses less digits than its factorization.

215928645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846804.

The product of its digits is 172800, while the sum is 42.

The square root of 215928645 is about 14694.5107097855. The cubic root of 215928645 is about 599.9339232789.

The spelling of 215928645 in words is "two hundred fifteen million, nine hundred twenty-eight thousand, six hundred forty-five".