25130728 has 24 divisors (see below), whose sum is σ = 54814050. Its totient is φ = 10770144.

The previous prime is 25130687. The next prime is 25130737. The reversal of 25130728 is 82703152.

It can be written as a sum of positive squares in only one way, i.e., 13557124 + 11573604 = 3682^2 + 3402^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 25130696 and 25130705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31663 + ... + 32446.

Almost surely, 2^25130728 is an apocalyptic number.

25130728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25130728 is an abundant number, since it is smaller than the sum of its proper divisors (29683322).

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

25130728 is a wasteful number, since it uses less digits than its factorization.

25130728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64129 (or 64118 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 25130728 is about 5013.0557547269. The cubic root of 25130728 is about 292.9105560093.

The spelling of 25130728 in words is "twenty-five million, one hundred thirty thousand, seven hundred twenty-eight".