28971591990 has 32 divisors (see below), whose sum is σ = 75852896256. Its totient is φ = 7023416160.

The previous prime is 28971591967. The next prime is 28971592003. The reversal of 28971591990 is 9919517982.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43896022 + ... + 43896681.

It is an arithmetic number, because the mean of its divisors is an integer number (2370403008).

Almost surely, 2^28971591990 is an apocalyptic number.

28971591990 is an abundant number, since it is smaller than the sum of its proper divisors (46881304266).

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

28971591990 is a wasteful number, since it uses less digits than its factorization.

28971591990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87792724.

The product of its (nonzero) digits is 3674160, while the sum is 60.

The spelling of 28971591990 in words is "twenty-eight billion, nine hundred seventy-one million, five hundred ninety-one thousand, nine hundred ninety".