25428399609 has 8 divisors (see below), whose sum is σ = 33905319552. Its totient is φ = 16951873040.

The previous prime is 25428399571. The next prime is 25428399631. The reversal of 25428399609 is 90699382452.

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

It is a cyclic number.

It is not a de Polignac number, because 25428399609 - 2²⁸ = 25159964153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25428399649) 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, 124864 + ... + 257774.

It is an arithmetic number, because the mean of its divisors is an integer number (4238164944).

Almost surely, 2^25428399609 is an apocalyptic number.

It is an amenable number.

25428399609 is a deficient number, since it is larger than the sum of its proper divisors (8476919943).

25428399609 is a wasteful number, since it uses less digits than its factorization.

25428399609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196687.

The product of its (nonzero) digits is 8398080, while the sum is 57.

The spelling of 25428399609 in words is "twenty-five billion, four hundred twenty-eight million, three hundred ninety-nine thousand, six hundred nine".