25723728 has 60 divisors (see below), whose sum is σ = 73763508. Its totient is φ = 8363520.

The previous prime is 25723727. The next prime is 25723793. The reversal of 25723728 is 82732752.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15303744 + 10419984 = 3912^2 + 3228^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25723692 and 25723701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25723727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3726 + ... + 8082.

Almost surely, 2^25723728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25723728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36881754).

25723728 is an abundant number, since it is smaller than the sum of its proper divisors (48039780).

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

25723728 is a wasteful number, since it uses less digits than its factorization.

25723728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4412 (or 4403 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 25723728 is about 5071.8564648460. The cubic root of 25723728 is about 295.1965672591.

The spelling of 25723728 in words is "twenty-five million, seven hundred twenty-three thousand, seven hundred twenty-eight".