25303640 has 16 divisors (see below), whose sum is σ = 56933280. Its totient is φ = 10121440.

The previous prime is 25303639. The next prime is 25303643. The reversal of 25303640 is 4630352.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25303643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316256 + ... + 316335.

It is an arithmetic number, because the mean of its divisors is an integer number (3558330).

Almost surely, 2^25303640 is an apocalyptic number.

25303640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25303640 is an abundant number, since it is smaller than the sum of its proper divisors (31629640).

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

25303640 is a wasteful number, since it uses less digits than its factorization.

25303640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632602 (or 632598 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 25303640 is about 5030.2723584315. The cubic root of 25303640 is about 293.5808115815.

Adding to 25303640 its reverse (4630352), we get a palindrome (29933992).

The spelling of 25303640 in words is "twenty-five million, three hundred three thousand, six hundred forty".