25641798 has 48 divisors (see below), whose sum is σ = 64254960. Its totient is φ = 6761664.

The previous prime is 25641793. The next prime is 25641821. The reversal of 25641798 is 89714652.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25641793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 468 + ... + 7176.

It is an arithmetic number, because the mean of its divisors is an integer number (1338645).

Almost surely, 2^25641798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25641798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32127480).

25641798 is an abundant number, since it is smaller than the sum of its proper divisors (38613162).

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

25641798 is a wasteful number, since it uses less digits than its factorization.

25641798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6741 (or 6734 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 25641798 is about 5063.7730991821. The cubic root of 25641798 is about 294.8828338693.

The spelling of 25641798 in words is "twenty-five million, six hundred forty-one thousand, seven hundred ninety-eight".