28025510906 has 8 divisors (see below), whose sum is σ = 42454487124. Its totient is φ = 13874015200.

The previous prime is 28025510899. The next prime is 28025510993. The reversal of 28025510906 is 60901552082.

It can be written as a sum of positive squares in 2 ways, for example, as 27936113881 + 89397025 = 167141^2 + 9455^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28025510906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69369875 + ... + 69370278.

Almost surely, 2^28025510906 is an apocalyptic number.

28025510906 is a deficient number, since it is larger than the sum of its proper divisors (14428976218).

28025510906 is a wasteful number, since it uses less digits than its factorization.

28025510906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138740256.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 28025510906 in words is "twenty-eight billion, twenty-five million, five hundred ten thousand, nine hundred six".