25506216 has 24 divisors (see below), whose sum is σ = 69079530. Its totient is φ = 8502048.

The previous prime is 25506203. The next prime is 25506233. The reversal of 25506216 is 61260552.

It can be written as a sum of positive squares in only one way, i.e., 25462116 + 44100 = 5046^2 + 210^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 25506216.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177055 + ... + 177198.

Almost surely, 2^25506216 is an apocalyptic number.

It is an amenable number.

25506216 is an abundant number, since it is smaller than the sum of its proper divisors (43573314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25506216 is a wasteful number, since it uses less digits than its factorization.

25506216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354265 (or 354258 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 25506216 is about 5050.3679073905. The cubic root of 25506216 is about 294.3621803280.

Adding to 25506216 its reverse (61260552), we get a palindrome (86766768).

The spelling of 25506216 in words is "twenty-five million, five hundred six thousand, two hundred sixteen".