25609340 has 36 divisors (see below), whose sum is σ = 56775096. Its totient is φ = 9701856.

The previous prime is 25609333. The next prime is 25609391. The reversal of 25609340 is 4390652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5447 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (1577086).

Almost surely, 2^25609340 is an apocalyptic number.

25609340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25609340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28387548).

25609340 is an abundant number, since it is smaller than the sum of its proper divisors (31165756).

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

25609340 is a wasteful number, since it uses less digits than its factorization.

25609340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594 (or 3573 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 25609340 is about 5060.5671618901. The cubic root of 25609340 is about 294.7583580896.

Adding to 25609340 its reverse (4390652), we get a palindrome (29999992).

The spelling of 25609340 in words is "twenty-five million, six hundred nine thousand, three hundred forty".