25305040 has 80 divisors (see below), whose sum is σ = 61746048. Its totient is φ = 9635328.

The previous prime is 25305013. The next prime is 25305053. The reversal of 25305040 is 4050352.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 25304999 and 25305017.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 245629 + ... + 245731.

Almost surely, 2^25305040 is an apocalyptic number.

25305040 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 25305040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30873024).

25305040 is an abundant number, since it is smaller than the sum of its proper divisors (36441008).

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

25305040 is a wasteful number, since it uses less digits than its factorization.

25305040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 25305040 is about 5030.4115139817. The cubic root of 25305040 is about 293.5862258954.

Adding to 25305040 its reverse (4050352), we get a palindrome (29355392).

The spelling of 25305040 in words is "twenty-five million, three hundred five thousand, forty".