25420647 has 16 divisors (see below), whose sum is σ = 38926592. Its totient is φ = 14454720.

The previous prime is 25420643. The next prime is 25420657. The reversal of 25420647 is 74602452.

It is not a de Polignac number, because 25420647 - 2² = 25420643 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 (25420643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1563 + ... + 7299.

It is an arithmetic number, because the mean of its divisors is an integer number (2432912).

Almost surely, 2^25420647 is an apocalyptic number.

25420647 is a deficient number, since it is larger than the sum of its proper divisors (13505945).

25420647 is a wasteful number, since it uses less digits than its factorization.

25420647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5958.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 25420647 is about 5041.8892292473. The cubic root of 25420647 is about 294.0326332419.

The spelling of 25420647 in words is "twenty-five million, four hundred twenty thousand, six hundred forty-seven".