25640435 has 8 divisors (see below), whose sum is σ = 31273296. Its totient is φ = 20175840.

The previous prime is 25640429. The next prime is 25640453. The reversal of 25640435 is 53404652.

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

It is not a de Polignac number, because 25640435 - 2²⁴ = 8863219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25640398 and 25640407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41729 + ... + 42338.

It is an arithmetic number, because the mean of its divisors is an integer number (3909162).

Almost surely, 2^25640435 is an apocalyptic number.

25640435 is a deficient number, since it is larger than the sum of its proper divisors (5632861).

25640435 is an equidigital number, since it uses as much as digits as its factorization.

25640435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84133.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 25640435 is about 5063.6385139542. The cubic root of 25640435 is about 294.8776089051.

The spelling of 25640435 in words is "twenty-five million, six hundred forty thousand, four hundred thirty-five".