216710425 has 12 divisors (see below), whose sum is σ = 269403516. Its totient is φ = 172928000.

The previous prime is 216710423. The next prime is 216710449. The reversal of 216710425 is 524017612.

It can be written as a sum of positive squares in 6 ways, for example, as 149769 + 216560656 = 387^2 + 14716^2 .

It is not a de Polignac number, because 216710425 - 2¹ = 216710423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216710393 and 216710402.

It is not an unprimeable number, because it can be changed into a prime (216710423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 784 + ... + 20833.

It is an arithmetic number, because the mean of its divisors is an integer number (22450293).

Almost surely, 2^216710425 is an apocalyptic number.

216710425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216710425 is a deficient number, since it is larger than the sum of its proper divisors (52693091).

216710425 is a wasteful number, since it uses less digits than its factorization.

216710425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22028 (or 22023 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 216710425 is about 14721.0877655152. The cubic root of 216710425 is about 600.6570810707.

The spelling of 216710425 in words is "two hundred sixteen million, seven hundred ten thousand, four hundred twenty-five".