25720291 has 8 divisors (see below), whose sum is σ = 26498160. Its totient is φ = 24946848.

The previous prime is 25720273. The next prime is 25720307. The reversal of 25720291 is 19202752.

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 25720291 - 2¹⁵ = 25687523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25720241) 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 7 ways as a sum of consecutive naturals, for example, 13500 + ... + 15286.

It is an arithmetic number, because the mean of its divisors is an integer number (3312270).

Almost surely, 2^25720291 is an apocalyptic number.

25720291 is a deficient number, since it is larger than the sum of its proper divisors (777869).

25720291 is a wasteful number, since it uses less digits than its factorization.

25720291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 25720291 is about 5071.5176229606. The cubic root of 25720291 is about 295.1834194008.

The spelling of 25720291 in words is "twenty-five million, seven hundred twenty thousand, two hundred ninety-one".