25130640 has 40 divisors (see below), whose sum is σ = 77905728. Its totient is φ = 6701440.

The previous prime is 25130629. The next prime is 25130653. The reversal of 25130640 is 4603152.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52116 + ... + 52595.

Almost surely, 2^25130640 is an apocalyptic number.

25130640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25130640 is an abundant number, since it is smaller than the sum of its proper divisors (52775088).

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

25130640 is a wasteful number, since it uses less digits than its factorization.

25130640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104727 (or 104721 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 25130640 is about 5013.0469776375. The cubic root of 25130640 is about 292.9102141149.

Adding to 25130640 its reverse (4603152), we get a palindrome (29733792).

The spelling of 25130640 in words is "twenty-five million, one hundred thirty thousand, six hundred forty".