25420649 has 4 divisors (see below), whose sum is σ = 25431636. Its totient is φ = 25409664.

The previous prime is 25420643. The next prime is 25420657. The reversal of 25420649 is 94602452.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20313049 + 5107600 = 4507^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 25420649 - 2²⁴ = 8643433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25420643) 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, 524 + ... + 7149.

It is an arithmetic number, because the mean of its divisors is an integer number (6357909).

Almost surely, 2^25420649 is an apocalyptic number.

It is an amenable number.

25420649 is a deficient number, since it is larger than the sum of its proper divisors (10987).

25420649 is an equidigital number, since it uses as much as digits as its factorization.

25420649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10986.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 25420649 is about 5041.8894275857. The cubic root of 25420649 is about 294.0326409531.

The spelling of 25420649 in words is "twenty-five million, four hundred twenty thousand, six hundred forty-nine".