25631728 has 20 divisors (see below), whose sum is σ = 50262408. Its totient is φ = 12660800.

The previous prime is 25631719. The next prime is 25631731. The reversal of 25631728 is 82713652.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25631693 and 25631702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8323 + ... + 10978.

Almost surely, 2^25631728 is an apocalyptic number.

It is an amenable number.

25631728 is a deficient number, since it is larger than the sum of its proper divisors (24630680).

25631728 is a wasteful number, since it uses less digits than its factorization.

25631728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19392 (or 19386 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 25631728 is about 5062.7786836874. The cubic root of 25631728 is about 294.8442268659.

The spelling of 25631728 in words is "twenty-five million, six hundred thirty-one thousand, seven hundred twenty-eight".