28851687905 has 8 divisors (see below), whose sum is σ = 35466465384. Its totient is φ = 22518390400.

The previous prime is 28851687859. The next prime is 28851687919. The reversal of 28851687905 is 50978615882.

It can be written as a sum of positive squares in 4 ways, for example, as 4268270224 + 24583417681 = 65332^2 + 156791^2 .

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

It is not a de Polignac number, because 28851687905 - 2³⁰ = 27777946081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70369766 + ... + 70370175.

It is an arithmetic number, because the mean of its divisors is an integer number (4433308173).

Almost surely, 2^28851687905 is an apocalyptic number.

It is an amenable number.

28851687905 is a deficient number, since it is larger than the sum of its proper divisors (6614777479).

28851687905 is a wasteful number, since it uses less digits than its factorization.

28851687905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140739987.

The product of its (nonzero) digits is 9676800, while the sum is 59.

The spelling of 28851687905 in words is "twenty-eight billion, eight hundred fifty-one million, six hundred eighty-seven thousand, nine hundred five".