117890728945 has 12 divisors (see below), whose sum is σ = 155498846580. Its totient is φ = 85738711520.

The previous prime is 117890728939. The next prime is 117890728957. The reversal of 117890728945 is 549827098711.

It can be written as a sum of positive squares in 2 ways, for example, as 70377192369 + 47513536576 = 265287^2 + 217976^2 .

It is not a de Polignac number, because 117890728945 - 2²³ = 117882340337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97429750 + ... + 97430959.

It is an arithmetic number, because the mean of its divisors is an integer number (12958237215).

Almost surely, 2^117890728945 is an apocalyptic number.

It is an amenable number.

117890728945 is a deficient number, since it is larger than the sum of its proper divisors (37608117635).

117890728945 is a wasteful number, since it uses less digits than its factorization.

117890728945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194860736 (or 194860725 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 61.

The spelling of 117890728945 in words is "one hundred seventeen billion, eight hundred ninety million, seven hundred twenty-eight thousand, nine hundred forty-five".