7700778641 has 16 divisors (see below), whose sum is σ = 8230118400. Its totient is φ = 7184091600.

The previous prime is 7700778637. The next prime is 7700778647. The reversal of 7700778641 is 1468770077.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7700778641 - 2² = 7700778637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7700778647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1306940 + ... + 1312818.

It is an arithmetic number, because the mean of its divisors is an integer number (514382400).

Almost surely, 2^7700778641 is an apocalyptic number.

7700778641 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

7700778641 is a deficient number, since it is larger than the sum of its proper divisors (529339759).

7700778641 is a wasteful number, since it uses less digits than its factorization.

7700778641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940.

The product of its (nonzero) digits is 460992, while the sum is 47.

The square root of 7700778641 is about 87754.0804806249. The cubic root of 7700778641 is about 1974.7473813304.

The spelling of 7700778641 in words is "seven billion, seven hundred million, seven hundred seventy-eight thousand, six hundred forty-one".