7771803138 has 54 divisors (see below), whose sum is σ = 18518684457. Its totient is φ = 2353845120.

The previous prime is 7771803131. The next prime is 7771803209. The reversal of 7771803138 is 8313081777.

It can be written as a sum of positive squares in 2 ways, for example, as 7769188449 + 2614689 = 88143^2 + 1617^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=62337.

It is a junction number, because it is equal to n+sod(n) for n = 7771803093 and 7771803102.

It is not an unprimeable number, because it can be changed into a prime (7771803131) 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, 4113298 + ... + 4115186.

Almost surely, 2^7771803138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7771803138

7771803138 is an abundant number, since it is smaller than the sum of its proper divisors (10746881319).

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

7771803138 is a wasteful number, since it uses less digits than its factorization.

7771803138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808 (or 1905 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 7771803138 is about 88157.8308376516. The cubic root of 7771803138 is about 1980.7998620208.

The spelling of 7771803138 in words is "seven billion, seven hundred seventy-one million, eight hundred three thousand, one hundred thirty-eight".