25819638 has 32 divisors (see below), whose sum is σ = 56802816. Its totient is φ = 7774368.

The previous prime is 25819637. The next prime is 25819643. The reversal of 25819638 is 83691852.

It is a self number, because there is not a number n which added to its sum of digits gives 25819638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25819631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145 + ... + 7187.

It is an arithmetic number, because the mean of its divisors is an integer number (1775088).

Almost surely, 2^25819638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25819638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28401408).

25819638 is an abundant number, since it is smaller than the sum of its proper divisors (30983178).

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

25819638 is a wasteful number, since it uses less digits than its factorization.

25819638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7108.

The product of its digits is 103680, while the sum is 42.

The square root of 25819638 is about 5081.3027857037. The cubic root of 25819638 is about 295.5629888542.

The spelling of 25819638 in words is "twenty-five million, eight hundred nineteen thousand, six hundred thirty-eight".