8387783291889 has 27 divisors (see below), whose sum is σ = 12140398111777. Its totient is φ = 5580473591616.

The previous prime is 8387783291851. The next prime is 8387783291891. The reversal of 8387783291889 is 9881923877838.

The square root of 8387783291889 is 2896167.

It is a perfect power (a square), and thus also a powerful number.

8387783291889 is a `hidden beast` number, since 8 + 387 + 78 + 3 + 2 + 91 + 8 + 89 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4524907515489 + 3862875776400 = 2127183^2 + 1965420^2 .

It is not a de Polignac number, because 8387783291889 - 2¹³ = 8387783283697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8387783291189) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8280140947 + ... + 8280141959.

Almost surely, 2^{8387783291889} is an apocalyptic number.

8387783291889 is the 2896167-th square number.

8387783291889 is the 1448084-th centered octagonal number.

It is an amenable number.

8387783291889 is a deficient number, since it is larger than the sum of its proper divisors (3752614819888).

8387783291889 is an frugal number, since it uses more digits than its factorization.

8387783291889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938 (or 1969 counting only the distinct ones).

The product of its digits is 2341011456, while the sum is 81.

Multiplying 8387783291889 by its sum of digits (81), we get a square (679410446643009 = 26065503²).

The spelling of 8387783291889 in words is "eight trillion, three hundred eighty-seven billion, seven hundred eighty-three million, two hundred ninety-one thousand, eight hundred eighty-nine".