28555561345 has 8 divisors (see below), whose sum is σ = 34995752064. Its totient is φ = 22358396784.

The previous prime is 28555561271. The next prime is 28555561357. The reversal of 28555561345 is 54316555582.

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 28555561345 - 2⁹ = 28555560833 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, 60756279 + ... + 60756748.

It is an arithmetic number, because the mean of its divisors is an integer number (4374469008).

Almost surely, 2^28555561345 is an apocalyptic number.

It is an amenable number.

28555561345 is a deficient number, since it is larger than the sum of its proper divisors (6440190719).

28555561345 is a wasteful number, since it uses less digits than its factorization.

28555561345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121513079.

The product of its digits is 3600000, while the sum is 49.

The spelling of 28555561345 in words is "twenty-eight billion, five hundred fifty-five million, five hundred sixty-one thousand, three hundred forty-five".