28550471998 has 4 divisors (see below), whose sum is σ = 42825708000. Its totient is φ = 14275235998.

The previous prime is 28550471953. The next prime is 28550472017. The reversal of 28550471998 is 89917405582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89917405582 = 2 ⋅44958702791.

It is a super-2 number, since 2×28550471998² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7137617998 + ... + 7137618001.

It is an arithmetic number, because the mean of its divisors is an integer number (10706427000).

Almost surely, 2^28550471998 is an apocalyptic number.

28550471998 is a deficient number, since it is larger than the sum of its proper divisors (14275236002).

28550471998 is a wasteful number, since it uses less digits than its factorization.

28550471998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14275236001.

The product of its (nonzero) digits is 7257600, while the sum is 58.

The spelling of 28550471998 in words is "twenty-eight billion, five hundred fifty million, four hundred seventy-one thousand, nine hundred ninety-eight".