216404625 has 32 divisors (see below), whose sum is σ = 366238080. Its totient is φ = 113448000.

The previous prime is 216404609. The next prime is 216404627. The reversal of 216404625 is 526404612.

It is not a de Polignac number, because 216404625 - 2⁴ = 216404609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216404592 and 216404601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216404627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17235 + ... + 27015.

It is an arithmetic number, because the mean of its divisors is an integer number (11444940).

Almost surely, 2^216404625 is an apocalyptic number.

216404625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216404625 is a deficient number, since it is larger than the sum of its proper divisors (149833455).

216404625 is an equidigital number, since it uses as much as digits as its factorization.

216404625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9858 (or 9848 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 216404625 is about 14710.6976381136. The cubic root of 216404625 is about 600.3744190798.

The spelling of 216404625 in words is "two hundred sixteen million, four hundred four thousand, six hundred twenty-five".