25721575 has 24 divisors (see below), whose sum is σ = 35127216. Its totient is φ = 18682400.

The previous prime is 25721557. The next prime is 25721609. The reversal of 25721575 is 57512752.

It is not a de Polignac number, because 25721575 - 2⁵ = 25721543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25721575.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32889 + ... + 33661.

It is an arithmetic number, because the mean of its divisors is an integer number (1463634).

Almost surely, 2^25721575 is an apocalyptic number.

25721575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25721575 is a deficient number, since it is larger than the sum of its proper divisors (9405641).

25721575 is an equidigital number, since it uses as much as digits as its factorization.

25721575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 789 counting only the distinct ones).

The product of its digits is 24500, while the sum is 34.

The square root of 25721575 is about 5071.6442107072. The cubic root of 25721575 is about 295.1883313359.

The spelling of 25721575 in words is "twenty-five million, seven hundred twenty-one thousand, five hundred seventy-five".