25522218 has 12 divisors (see below), whose sum is σ = 55298178. Its totient is φ = 8507400.

The previous prime is 25522201. The next prime is 25522229. The reversal of 25522218 is 81222552.

It can be written as a sum of positive squares in only one way, i.e., 24770529 + 751689 = 4977^2 + 867^2 .

It is a super-2 number, since 2×25522218² = 1302767223279048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25522191 and 25522200.

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, 708933 + ... + 708968.

Almost surely, 2^25522218 is an apocalyptic number.

25522218 is an abundant number, since it is smaller than the sum of its proper divisors (29775960).

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

25522218 is a wasteful number, since it uses less digits than its factorization.

25522218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417909 (or 1417906 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 25522218 is about 5051.9519000086. The cubic root of 25522218 is about 294.4237260952.

The spelling of 25522218 in words is "twenty-five million, five hundred twenty-two thousand, two hundred eighteen".