25442647 has 8 divisors (see below), whose sum is σ = 25911536. Its totient is φ = 24976512.

The previous prime is 25442639. The next prime is 25442687. The reversal of 25442647 is 74624452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25442647 - 2³ = 25442639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25442687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28573 + ... + 29449.

It is an arithmetic number, because the mean of its divisors is an integer number (3238942).

Almost surely, 2^25442647 is an apocalyptic number.

25442647 is a deficient number, since it is larger than the sum of its proper divisors (468889).

25442647 is an equidigital number, since it uses as much as digits as its factorization.

25442647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377.

The product of its digits is 53760, while the sum is 34.

The square root of 25442647 is about 5044.0704792856. The cubic root of 25442647 is about 294.1174311457.

The spelling of 25442647 in words is "twenty-five million, four hundred forty-two thousand, six hundred forty-seven".