25662216 has 32 divisors (see below), whose sum is σ = 66369600. Its totient is φ = 8258880.

The previous prime is 25662199. The next prime is 25662239. The reversal of 25662216 is 61226652.

It is a congruent 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, 17740 + ... + 19131.

It is an arithmetic number, because the mean of its divisors is an integer number (2074050).

Almost surely, 2^25662216 is an apocalyptic number.

It is an amenable number.

25662216 is an abundant number, since it is smaller than the sum of its proper divisors (40707384).

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

25662216 is a wasteful number, since it uses less digits than its factorization.

25662216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36909 (or 36905 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 25662216 is about 5065.7887835953. The cubic root of 25662216 is about 294.9610826761.

Adding to 25662216 its reverse (61226652), we get a palindrome (86888868).

It can be divided in two parts, 25662 and 216, that added together give a triangular number (25878 = T₂₂₇).

The spelling of 25662216 in words is "twenty-five million, six hundred sixty-two thousand, two hundred sixteen".