25719641 has 4 divisors (see below), whose sum is σ = 25762212. Its totient is φ = 25677072.

The previous prime is 25719637. The next prime is 25719643. The reversal of 25719641 is 14691752.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4752400 + 20967241 = 2180^2 + 4579^2 .

It is a cyclic number.

It is not a de Polignac number, because 25719641 - 2² = 25719637 is a prime.

It is a super-2 number, since 2×25719641² = 1322999866337762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25719643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20366 + ... + 21591.

It is an arithmetic number, because the mean of its divisors is an integer number (6440553).

Almost surely, 2^25719641 is an apocalyptic number.

It is an amenable number.

25719641 is a deficient number, since it is larger than the sum of its proper divisors (42571).

25719641 is an equidigital number, since it uses as much as digits as its factorization.

25719641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42570.

The product of its digits is 15120, while the sum is 35.

The square root of 25719641 is about 5071.4535391740. The cubic root of 25719641 is about 295.1809327669.

The spelling of 25719641 in words is "twenty-five million, seven hundred nineteen thousand, six hundred forty-one".