25709825 has 6 divisors (see below), whose sum is σ = 31880214. Its totient is φ = 20567840.

The previous prime is 25709821. The next prime is 25709851. The reversal of 25709825 is 52890752.

It can be written as a sum of positive squares in 3 ways, for example, as 146689 + 25563136 = 383^2 + 5056^2 .

It is not a de Polignac number, because 25709825 - 2² = 25709821 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25709821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 514172 + ... + 514221.

It is an arithmetic number, because the mean of its divisors is an integer number (5313369).

Almost surely, 2^25709825 is an apocalyptic number.

25709825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25709825 is a deficient number, since it is larger than the sum of its proper divisors (6170389).

25709825 is a wasteful number, since it uses less digits than its factorization.

25709825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028403 (or 1028398 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 25709825 is about 5070.4856769347. The cubic root of 25709825 is about 295.1433756755.

The spelling of 25709825 in words is "twenty-five million, seven hundred nine thousand, eight hundred twenty-five".