25278641 has 4 divisors (see below), whose sum is σ = 25418484. Its totient is φ = 25138800.

The previous prime is 25278629. The next prime is 25278647. The reversal of 25278641 is 14687252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5387041 + 19891600 = 2321^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 25278641 - 2⁶ = 25278577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25278647) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 69650 + ... + 70011.

It is an arithmetic number, because the mean of its divisors is an integer number (6354621).

Almost surely, 2^25278641 is an apocalyptic number.

It is an amenable number.

25278641 is a deficient number, since it is larger than the sum of its proper divisors (139843).

25278641 is a wasteful number, since it uses less digits than its factorization.

25278641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139842.

The product of its digits is 26880, while the sum is 35.

The square root of 25278641 is about 5027.7868888806. The cubic root of 25278641 is about 293.4840976305.

The spelling of 25278641 in words is "twenty-five million, two hundred seventy-eight thousand, six hundred forty-one".