25782649 has 4 divisors (see below), whose sum is σ = 26331264. Its totient is φ = 25234036.

The previous prime is 25782641. The next prime is 25782661. The reversal of 25782649 is 94628752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25782649 - 2³ = 25782641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25782641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 274237 + ... + 274330.

It is an arithmetic number, because the mean of its divisors is an integer number (6582816).

Almost surely, 2^25782649 is an apocalyptic number.

It is an amenable number.

25782649 is a deficient number, since it is larger than the sum of its proper divisors (548615).

25782649 is an equidigital number, since it uses as much as digits as its factorization.

25782649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548614.

The product of its digits is 241920, while the sum is 43.

The square root of 25782649 is about 5077.6617650253. The cubic root of 25782649 is about 295.4217810366.

The spelling of 25782649 in words is "twenty-five million, seven hundred eighty-two thousand, six hundred forty-nine".