25781628 has 24 divisors (see below), whose sum is σ = 60692688. Its totient is φ = 8517376.

The previous prime is 25781617. The next prime is 25781633. The reversal of 25781628 is 82618752.

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 7 ways as a sum of consecutive naturals, for example, 8151 + ... + 10862.

It is an arithmetic number, because the mean of its divisors is an integer number (2528862).

Almost surely, 2^25781628 is an apocalyptic number.

It is an amenable number.

25781628 is an abundant number, since it is smaller than the sum of its proper divisors (34911060).

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

25781628 is a wasteful number, since it uses less digits than its factorization.

25781628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19133 (or 19131 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 25781628 is about 5077.5612256279. The cubic root of 25781628 is about 295.4178813905.

The spelling of 25781628 in words is "twenty-five million, seven hundred eighty-one thousand, six hundred twenty-eight".