18860948640 has 144 divisors (see below), whose sum is σ = 64401724296. Its totient is φ = 5026560000.

The previous prime is 18860948597. The next prime is 18860948657. The reversal of 18860948640 is 4684906881.

It can be written as a sum of positive squares in 4 ways, for example, as 14259225744 + 4601722896 = 119412^2 + 67836^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3425890 + ... + 3431390.

Almost surely, 2^18860948640 is an apocalyptic number.

18860948640 is a gapful number since it is divisible by the number (10) 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 18860948640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32200862148).

18860948640 is an abundant number, since it is smaller than the sum of its proper divisors (45540775656).

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

18860948640 is a wasteful number, since it uses less digits than its factorization.

18860948640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7903 (or 7892 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 18860948640 in words is "eighteen billion, eight hundred sixty million, nine hundred forty-eight thousand, six hundred forty".