28071911890 has 16 divisors (see below), whose sum is σ = 55123027200. Its totient is φ = 10207967920.

The previous prime is 28071911863. The next prime is 28071911891. The reversal of 28071911890 is 9811917082.

It is a self number, because there is not a number n which added to its sum of digits gives 28071911890.

It is not an unprimeable number, because it can be changed into a prime (28071911891) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 127599490 + ... + 127599709.

It is an arithmetic number, because the mean of its divisors is an integer number (3445189200).

Almost surely, 2^28071911890 is an apocalyptic number.

28071911890 is a deficient number, since it is larger than the sum of its proper divisors (27051115310).

28071911890 is a wasteful number, since it uses less digits than its factorization.

28071911890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255199217.

The product of its (nonzero) digits is 72576, while the sum is 46.

The spelling of 28071911890 in words is "twenty-eight billion, seventy-one million, nine hundred eleven thousand, eight hundred ninety".