28005005555 has 8 divisors (see below), whose sum is σ = 33793750800. Its totient is φ = 22278841696.

The previous prime is 28005005533. The next prime is 28005005599. The reversal of 28005005555 is 55550050082.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28005005555 is a prime.

It is a super-2 number, since 2×28005005555² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15644360 + ... + 15646149.

It is an arithmetic number, because the mean of its divisors is an integer number (4224218850).

Almost surely, 2^28005005555 is an apocalyptic number.

28005005555 is a deficient number, since it is larger than the sum of its proper divisors (5788745245).

28005005555 is a wasteful number, since it uses less digits than its factorization.

28005005555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31290693.

The product of its (nonzero) digits is 50000, while the sum is 35.

The spelling of 28005005555 in words is "twenty-eight billion, five million, five thousand, five hundred fifty-five".