25640481 has 8 divisors (see below), whose sum is σ = 35986720. Its totient is φ = 16193952.

The previous prime is 25640479. The next prime is 25640501. The reversal of 25640481 is 18404652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25640481 - 2¹ = 25640479 is a prime.

It is a super-2 number, since 2×25640481² = 1314868531822722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224860 + ... + 224973.

It is an arithmetic number, because the mean of its divisors is an integer number (4498340).

Almost surely, 2^25640481 is an apocalyptic number.

It is an amenable number.

25640481 is a deficient number, since it is larger than the sum of its proper divisors (10346239).

25640481 is a wasteful number, since it uses less digits than its factorization.

25640481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449855.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 25640481 is about 5063.6430561405. The cubic root of 25640481 is about 294.8777852459.

The spelling of 25640481 in words is "twenty-five million, six hundred forty thousand, four hundred eighty-one".