25478647 has 2 divisors, whose sum is σ = 25478648. Its totient is φ = 25478646.

The previous prime is 25478633. The next prime is 25478657. The reversal of 25478647 is 74687452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25478647 - 2¹¹ = 25476599 is a prime.

It is a super-2 number, since 2×25478647² = 1298322905901218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25478627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12739323 + 12739324.

It is an arithmetic number, because the mean of its divisors is an integer number (12739324).

Almost surely, 2^25478647 is an apocalyptic number.

25478647 is a deficient number, since it is larger than the sum of its proper divisors (1).

25478647 is an equidigital number, since it uses as much as digits as its factorization.

25478647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 43.

The square root of 25478647 is about 5047.6377643409. The cubic root of 25478647 is about 294.2560859735.

The spelling of 25478647 in words is "twenty-five million, four hundred seventy-eight thousand, six hundred forty-seven".