28518770785 has 8 divisors (see below), whose sum is σ = 34223648616. Its totient is φ = 22814267520.

The previous prime is 28518770783. The next prime is 28518770849. The reversal of 28518770785 is 58707781582.

It can be written as a sum of positive squares in 4 ways, for example, as 20775474769 + 7743296016 = 144137^2 + 87996^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28518770785 - 2¹ = 28518770783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28518770783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116907 + ... + 265903.

It is an arithmetic number, because the mean of its divisors is an integer number (4277956077).

Almost surely, 2^28518770785 is an apocalyptic number.

It is an amenable number.

28518770785 is a deficient number, since it is larger than the sum of its proper divisors (5704877831).

28518770785 is a wasteful number, since it uses less digits than its factorization.

28518770785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187283.

The product of its (nonzero) digits is 8780800, while the sum is 58.

The spelling of 28518770785 in words is "twenty-eight billion, five hundred eighteen million, seven hundred seventy thousand, seven hundred eighty-five".