28773218540688 has 80 divisors (see below), whose sum is σ = 75088091304576. Its totient is φ = 9493413683200.

The previous prime is 28773218540663. The next prime is 28773218540723. The reversal of 28773218540688 is 88604581237782.

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, 16257520 + ... + 17940272.

Almost surely, 2^{28773218540688} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28773218540688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37544045652288).

28773218540688 is an abundant number, since it is smaller than the sum of its proper divisors (46314872763888).

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

28773218540688 is a wasteful number, since it uses less digits than its factorization.

28773218540688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686392 (or 1686386 counting only the distinct ones).

The product of its (nonzero) digits is 289013760, while the sum is 69.

The spelling of 28773218540688 in words is "twenty-eight trillion, seven hundred seventy-three billion, two hundred eighteen million, five hundred forty thousand, six hundred eighty-eight".