85399072728 has 32 divisors (see below), whose sum is σ = 213639068160. Its totient is φ = 28447506080.

The previous prime is 85399072699. The next prime is 85399072747. The reversal of 85399072728 is 82727099358.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1141200 + ... + 1213727.

It is an arithmetic number, because the mean of its divisors is an integer number (6676220880).

Almost surely, 2^85399072728 is an apocalyptic number.

It is an amenable number.

85399072728 is an abundant number, since it is smaller than the sum of its proper divisors (128239995432).

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

85399072728 is a wasteful number, since it uses less digits than its factorization.

85399072728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356447 (or 2356443 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 85399072728 in words is "eighty-five billion, three hundred ninety-nine million, seventy-two thousand, seven hundred twenty-eight".