25640479 has 2 divisors, whose sum is σ = 25640480. Its totient is φ = 25640478.

The previous prime is 25640467. The next prime is 25640501. The reversal of 25640479 is 97404652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25640479 - 2⁹ = 25639967 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25640429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820239 + 12820240.

It is an arithmetic number, because the mean of its divisors is an integer number (12820240).

Almost surely, 2^25640479 is an apocalyptic number.

25640479 is a deficient number, since it is larger than the sum of its proper divisors (1).

25640479 is an equidigital number, since it uses as much as digits as its factorization.

25640479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 25640479 is about 5063.6428586542. The cubic root of 25640479 is about 294.8777775789.

The spelling of 25640479 in words is "twenty-five million, six hundred forty thousand, four hundred seventy-nine".