28991317390 has 32 divisors (see below), whose sum is σ = 62778193920. Its totient is φ = 9416728224.

The previous prime is 28991317373. The next prime is 28991317441. The reversal of 28991317390 is 9371319982.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10897662 + ... + 10900321.

It is an arithmetic number, because the mean of its divisors is an integer number (1961818560).

Almost surely, 2^28991317390 is an apocalyptic number.

28991317390 is an abundant number, since it is smaller than the sum of its proper divisors (33786876530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28991317390 is a wasteful number, since it uses less digits than its factorization.

28991317390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21798016.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 28991317390 in words is "twenty-eight billion, nine hundred ninety-one million, three hundred seventeen thousand, three hundred ninety".