25720525 has 12 divisors (see below), whose sum is σ = 32101492. Its totient is φ = 20442240.

The previous prime is 25720511. The next prime is 25720543. The reversal of 25720525 is 52502752.

It can be written as a sum of positive squares in 6 ways, for example, as 2709316 + 23011209 = 1646^2 + 4797^2 .

It is not a de Polignac number, because 25720525 - 2¹³ = 25712333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25720493 and 25720502.

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 11 ways as a sum of consecutive naturals, for example, 649 + ... + 7201.

Almost surely, 2^25720525 is an apocalyptic number.

25720525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25720525 is a deficient number, since it is larger than the sum of its proper divisors (6380967).

25720525 is a wasteful number, since it uses less digits than its factorization.

25720525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6720 (or 6715 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 25720525 is about 5071.5406929256. The cubic root of 25720525 is about 295.1843145787.

The spelling of 25720525 in words is "twenty-five million, seven hundred twenty thousand, five hundred twenty-five".