25506725 has 6 divisors (see below), whose sum is σ = 31628370. Its totient is φ = 20405360.

The previous prime is 25506673. The next prime is 25506737. The reversal of 25506725 is 52760552.

It can be written as a sum of positive squares in 3 ways, for example, as 8868484 + 16638241 = 2978^2 + 4079^2 .

It is not a de Polignac number, because 25506725 - 2⁶ = 25506661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25506691 and 25506700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 510110 + ... + 510159.

It is an arithmetic number, because the mean of its divisors is an integer number (5271395).

Almost surely, 2^25506725 is an apocalyptic number.

25506725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25506725 is a deficient number, since it is larger than the sum of its proper divisors (6121645).

25506725 is a wasteful number, since it uses less digits than its factorization.

25506725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020279 (or 1020274 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 25506725 is about 5050.4182995075. The cubic root of 25506725 is about 294.3641384044.

The spelling of 25506725 in words is "twenty-five million, five hundred six thousand, seven hundred twenty-five".