25645823 has 4 divisors (see below), whose sum is σ = 29309520. Its totient is φ = 21982128.

The previous prime is 25645817. The next prime is 25645871. The reversal of 25645823 is 32854652.

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

It is not a de Polignac number, because 25645823 - 2¹⁰ = 25644799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25645813) 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, 1831838 + ... + 1831851.

It is an arithmetic number, because the mean of its divisors is an integer number (7327380).

Almost surely, 2^25645823 is an apocalyptic number.

25645823 is a deficient number, since it is larger than the sum of its proper divisors (3663697).

25645823 is an equidigital number, since it uses as much as digits as its factorization.

25645823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663696.

The product of its digits is 57600, while the sum is 35.

The square root of 25645823 is about 5064.1705145068. The cubic root of 25645823 is about 294.8982623415.

The spelling of 25645823 in words is "twenty-five million, six hundred forty-five thousand, eight hundred twenty-three".