25628405279 has 4 divisors (see below), whose sum is σ = 25629284184. Its totient is φ = 25627526376.

The previous prime is 25628405221. The next prime is 25628405321. The reversal of 25628405279 is 97250482652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25628405279 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 (25628405479) 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, 394157 + ... + 454550.

It is an arithmetic number, because the mean of its divisors is an integer number (6407321046).

Almost surely, 2^25628405279 is an apocalyptic number.

25628405279 is a deficient number, since it is larger than the sum of its proper divisors (878905).

25628405279 is an equidigital number, since it uses as much as digits as its factorization.

25628405279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878904.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 25628405279 in words is "twenty-five billion, six hundred twenty-eight million, four hundred five thousand, two hundred seventy-nine".