25818534 has 64 divisors (see below), whose sum is σ = 66124800. Its totient is φ = 7314624.

The previous prime is 25818521. The next prime is 25818539. The reversal of 25818534 is 43581852.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25818539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62922 + ... + 63330.

It is an arithmetic number, because the mean of its divisors is an integer number (1033200).

Almost surely, 2^25818534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25818534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33062400).

25818534 is an abundant number, since it is smaller than the sum of its proper divisors (40306266).

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

25818534 is a wasteful number, since it uses less digits than its factorization.

25818534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 588 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 25818534 is about 5081.1941509846. The cubic root of 25818534 is about 295.5587762184.

The spelling of 25818534 in words is "twenty-five million, eight hundred eighteen thousand, five hundred thirty-four".