25218036 has 36 divisors (see below), whose sum is σ = 64953252. Its totient is φ = 8246784.

The previous prime is 25218031. The next prime is 25218041. The reversal of 25218036 is 63081252.

It is an interprime number because it is at equal distance from previous prime (25218031) and next prime (25218041).

It can be written as a sum of positive squares in 2 ways, for example, as 14288400 + 10929636 = 3780^2 + 3306^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (25218031) 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, 4701 + ... + 8516.

It is an arithmetic number, because the mean of its divisors is an integer number (1804257).

Almost surely, 2^25218036 is an apocalyptic number.

It is an amenable number.

25218036 is an abundant number, since it is smaller than the sum of its proper divisors (39735216).

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

25218036 is a wasteful number, since it uses less digits than its factorization.

25218036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13280 (or 13275 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 25218036 is about 5021.7562664869. The cubic root of 25218036 is about 293.2493693338.

Adding to 25218036 its reverse (63081252), we get a palindrome (88299288).

The spelling of 25218036 in words is "twenty-five million, two hundred eighteen thousand, thirty-six".