18840510728 has 36 divisors (see below), whose sum is σ = 38262618135. Its totient is φ = 8693290944.

The previous prime is 18840510701. The next prime is 18840510737. The reversal of 18840510728 is 82701504881.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 3468974404 + 15371536324 = 58898^2 + 123982^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=97058.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5045150 + ... + 5048882.

Almost surely, 2^18840510728 is an apocalyptic number.

It is an amenable number.

18840510728 is an abundant number, since it is smaller than the sum of its proper divisors (19422107407).

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

18840510728 is an frugal number, since it uses more digits than its factorization.

18840510728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7498 (or 3748 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 44.

The spelling of 18840510728 in words is "eighteen billion, eight hundred forty million, five hundred ten thousand, seven hundred twenty-eight".