25720547 has 4 divisors (see below), whose sum is σ = 27074280. Its totient is φ = 24366816.

The previous prime is 25720543. The next prime is 25720549. The reversal of 25720547 is 74502752.

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

It is not a de Polignac number, because 25720547 - 2² = 25720543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25720543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676838 + ... + 676875.

It is an arithmetic number, because the mean of its divisors is an integer number (6768570).

Almost surely, 2^25720547 is an apocalyptic number.

25720547 is a deficient number, since it is larger than the sum of its proper divisors (1353733).

25720547 is a wasteful number, since it uses less digits than its factorization.

25720547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353732.

The product of its (nonzero) digits is 19600, while the sum is 32.

The square root of 25720547 is about 5071.5428618912. The cubic root of 25720547 is about 295.1843987405.

The spelling of 25720547 in words is "twenty-five million, seven hundred twenty thousand, five hundred forty-seven".