25728918 has 16 divisors (see below), whose sum is σ = 51704256. Its totient is φ = 8535240.

The previous prime is 25728917. The next prime is 25728971. The reversal of 25728918 is 81982752.

It is a self number, because there is not a number n which added to its sum of digits gives 25728918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25728917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8896 + ... + 11427.

It is an arithmetic number, because the mean of its divisors is an integer number (3231516).

Almost surely, 2^25728918 is an apocalyptic number.

25728918 is an abundant number, since it is smaller than the sum of its proper divisors (25975338).

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

25728918 is a wasteful number, since it uses less digits than its factorization.

25728918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20539.

The product of its digits is 80640, while the sum is 42.

The square root of 25728918 is about 5072.3680860127. The cubic root of 25728918 is about 295.2164188031.

The spelling of 25728918 in words is "twenty-five million, seven hundred twenty-eight thousand, nine hundred eighteen".