216364625 has 8 divisors (see below), whose sum is σ = 270023208. Its totient is φ = 173091600.

The previous prime is 216364591. The next prime is 216364669. The reversal of 216364625 is 526463612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 744769 + 215619856 = 863^2 + 14684^2 .

It is not a de Polignac number, because 216364625 - 2¹⁶ = 216299089 is a prime.

It is a Duffinian 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, 865334 + ... + 865583.

It is an arithmetic number, because the mean of its divisors is an integer number (33752901).

Almost surely, 2^216364625 is an apocalyptic number.

216364625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216364625 is a deficient number, since it is larger than the sum of its proper divisors (53658583).

216364625 is an equidigital number, since it uses as much as digits as its factorization.

216364625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730932 (or 1730922 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 216364625 is about 14709.3380204549. The cubic root of 216364625 is about 600.3374259447.

The spelling of 216364625 in words is "two hundred sixteen million, three hundred sixty-four thousand, six hundred twenty-five".