7766678340 has 36 divisors (see below), whose sum is σ = 23558924844. Its totient is φ = 2071114176.

The previous prime is 7766678323. The next prime is 7766678347. The reversal of 7766678340 is 438766677.

It can be written as a sum of positive squares in 2 ways, for example, as 2765077056 + 5001601284 = 52584^2 + 70722^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (7766678347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21573927 + ... + 21574286.

It is an arithmetic number, because the mean of its divisors is an integer number (654414579).

Almost surely, 2^7766678340 is an apocalyptic number.

It is an amenable number.

7766678340 is an abundant number, since it is smaller than the sum of its proper divisors (15792246504).

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

7766678340 is a wasteful number, since it uses less digits than its factorization.

7766678340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43148228 (or 43148223 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 54.

The square root of 7766678340 is about 88128.7600048928. The cubic root of 7766678340 is about 1980.3643804441.

The spelling of 7766678340 in words is "seven billion, seven hundred sixty-six million, six hundred seventy-eight thousand, three hundred forty".