7840664464 has 20 divisors (see below), whose sum is σ = 15199439004. Its totient is φ = 3918228608.

The previous prime is 7840664459. The next prime is 7840664473. The reversal of 7840664464 is 4644660487.

It can be written as a sum of positive squares in 2 ways, for example, as 6242264064 + 1598400400 = 79008^2 + 39980^2 .

It is a super-2 number, since 2×7840664464² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100507 + ... + 160570.

Almost surely, 2^7840664464 is an apocalyptic number.

It is an amenable number.

7840664464 is a deficient number, since it is larger than the sum of its proper divisors (7358774540).

7840664464 is a wasteful number, since it uses less digits than its factorization.

7840664464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262962 (or 262956 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 49.

The square root of 7840664464 is about 88547.5265831858. The cubic root of 7840664464 is about 1986.6328979941.

The spelling of 7840664464 in words is "seven billion, eight hundred forty million, six hundred sixty-four thousand, four hundred sixty-four".