216322625 has 8 divisors (see below), whose sum is σ = 269970792. Its totient is φ = 173058000.

The previous prime is 216322597. The next prime is 216322669. The reversal of 216322625 is 526223612.

It can be written as a sum of positive squares in 4 ways, for example, as 614656 + 215707969 = 784^2 + 14687^2 .

It is not a de Polignac number, because 216322625 - 2⁸ = 216322369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865166 + ... + 865415.

It is an arithmetic number, because the mean of its divisors is an integer number (33746349).

Almost surely, 2^216322625 is an apocalyptic number.

216322625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216322625 is a deficient number, since it is larger than the sum of its proper divisors (53648167).

216322625 is an equidigital number, since it uses as much as digits as its factorization.

216322625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730596 (or 1730586 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 216322625 is about 14707.9102866451. The cubic root of 216322625 is about 600.2985782456.

The spelling of 216322625 in words is "two hundred sixteen million, three hundred twenty-two thousand, six hundred twenty-five".