25640767 has 4 divisors (see below), whose sum is σ = 25674880. Its totient is φ = 25606656.

The previous prime is 25640759. The next prime is 25640773. The reversal of 25640767 is 76704652.

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

It is a cyclic number.

It is not a de Polignac number, because 25640767 - 2³ = 25640759 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15903 + ... + 17440.

It is an arithmetic number, because the mean of its divisors is an integer number (6418720).

Almost surely, 2^25640767 is an apocalyptic number.

25640767 is a deficient number, since it is larger than the sum of its proper divisors (34113).

25640767 is an equidigital number, since it uses as much as digits as its factorization.

25640767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34112.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 25640767 is about 5063.6712965989. The cubic root of 25640767 is about 294.8788816207.

The spelling of 25640767 in words is "twenty-five million, six hundred forty thousand, seven hundred sixty-seven".