28888215556 has 48 divisors (see below), whose sum is σ = 54785082240. Its totient is φ = 13287464960.

The previous prime is 28888215547. The next prime is 28888215569. The reversal of 28888215556 is 65551288882.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a self number, because there is not a number n which added to its sum of digits gives 28888215556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664611 + ... + 706741.

It is an arithmetic number, because the mean of its divisors is an integer number (1141355880).

Almost surely, 2^28888215556 is an apocalyptic number.

It is an amenable number.

28888215556 is a deficient number, since it is larger than the sum of its proper divisors (25896866684).

28888215556 is a wasteful number, since it uses less digits than its factorization.

28888215556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42444 (or 42442 counting only the distinct ones).

The product of its digits is 12288000, while the sum is 58.

The spelling of 28888215556 in words is "twenty-eight billion, eight hundred eighty-eight million, two hundred fifteen thousand, five hundred fifty-six".