25720545 has 16 divisors (see below), whose sum is σ = 42481152. Its totient is φ = 13274880.

The previous prime is 25720543. The next prime is 25720549. The reversal of 25720545 is 54502752.

It is not a de Polignac number, because 25720545 - 2¹ = 25720543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25720543) 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, 27192 + ... + 28121.

It is an arithmetic number, because the mean of its divisors is an integer number (2655072).

Almost surely, 2^25720545 is an apocalyptic number.

It is an amenable number.

25720545 is a deficient number, since it is larger than the sum of its proper divisors (16760607).

25720545 is a wasteful number, since it uses less digits than its factorization.

25720545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55352.

The product of its (nonzero) digits is 14000, while the sum is 30.

The square root of 25720545 is about 5071.5426647126. The cubic root of 25720545 is about 295.1843910894.

It can be divided in two parts, 257 and 20545, that added together give a palindrome (20802).

The spelling of 25720545 in words is "twenty-five million, seven hundred twenty thousand, five hundred forty-five".