27728778320 has 80 divisors (see below), whose sum is σ = 67195794432. Its totient is φ = 10629411840.

The previous prime is 27728778313. The next prime is 27728778401. The reversal of 27728778320 is 2387782772.

It is a tau number, because it is divible by the number of its divisors (80).

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, 201164 + ... + 309716.

Almost surely, 2^27728778320 is an apocalyptic number.

27728778320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27728778320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33597897216).

27728778320 is an abundant number, since it is smaller than the sum of its proper divisors (39467016112).

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

27728778320 is a wasteful number, since it uses less digits than its factorization.

27728778320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108700 (or 108694 counting only the distinct ones).

The product of its (nonzero) digits is 3687936, while the sum is 53.

The spelling of 27728778320 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred seventy-eight thousand, three hundred twenty".