25609540 has 48 divisors (see below), whose sum is σ = 59693760. Its totient is φ = 9150080.

The previous prime is 25609537. The next prime is 25609541. The reversal of 25609540 is 4590652.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (25609541) 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, 11994 + ... + 13966.

It is an arithmetic number, because the mean of its divisors is an integer number (1243620).

Almost surely, 2^25609540 is an apocalyptic number.

25609540 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 25609540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29846880).

25609540 is an abundant number, since it is smaller than the sum of its proper divisors (34084220).

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

25609540 is a wasteful number, since it uses less digits than its factorization.

25609540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052 (or 2050 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 25609540 is about 5060.5869224824. The cubic root of 25609540 is about 294.7591254075.

It can be divided in two parts, 2560 and 9540, that added together give a square (12100 = 110²).

The spelling of 25609540 in words is "twenty-five million, six hundred nine thousand, five hundred forty".