25718216 has 8 divisors (see below), whose sum is σ = 48221670. Its totient is φ = 12859104.

The previous prime is 25718207. The next prime is 25718221. The reversal of 25718216 is 61281752.

It can be written as a sum of positive squares in only one way, i.e., 25300900 + 417316 = 5030^2 + 646^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×25718216² = 1322853268445312, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1607381 + ... + 1607396.

Almost surely, 2^25718216 is an apocalyptic number.

It is an amenable number.

25718216 is a deficient number, since it is larger than the sum of its proper divisors (22503454).

25718216 is a wasteful number, since it uses less digits than its factorization.

25718216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214783 (or 3214779 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 25718216 is about 5071.3130449618. The cubic root of 25718216 is about 295.1754811538.

Adding to 25718216 its reverse (61281752), we get a palindrome (86999968).

The spelling of 25718216 in words is "twenty-five million, seven hundred eighteen thousand, two hundred sixteen".