25645705 has 8 divisors (see below), whose sum is σ = 31525704. Its totient is φ = 20016000.

The previous prime is 25645679. The next prime is 25645721. The reversal of 25645705 is 50754652.

It can be written as a sum of positive squares in 4 ways, for example, as 2064969 + 23580736 = 1437^2 + 4856^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25645705 - 2¹⁷ = 25514633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62346 + ... + 62755.

It is an arithmetic number, because the mean of its divisors is an integer number (3940713).

Almost surely, 2^25645705 is an apocalyptic number.

It is an amenable number.

25645705 is a deficient number, since it is larger than the sum of its proper divisors (5879999).

25645705 is a wasteful number, since it uses less digits than its factorization.

25645705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125147.

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 25645705 is about 5064.1588640168. The cubic root of 25645705 is about 294.8978100515.

The spelling of 25645705 in words is "twenty-five million, six hundred forty-five thousand, seven hundred five".