7944669864 has 40 divisors (see below), whose sum is σ = 22252433610. Its totient is φ = 2648223072.

The previous prime is 7944669833. The next prime is 7944669871. The reversal of 7944669864 is 4689664497.

7944669864 is a `hidden beast` number, since 7 + 94 + 466 + 9 + 86 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4690880100 + 3253789764 = 68490^2 + 57042^2 .

It is a super-3 number, since 3×7944669864³ (a number of 31 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6129499 + ... + 6130794.

Almost surely, 2^7944669864 is an apocalyptic number.

It is an amenable number.

7944669864 is an abundant number, since it is smaller than the sum of its proper divisors (14307763746).

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

7944669864 is a wasteful number, since it uses less digits than its factorization.

7944669864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12260311 (or 12260298 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The square root of 7944669864 is about 89132.8775705127. The cubic root of 7944669864 is about 1995.3784843556.

The spelling of 7944669864 in words is "seven billion, nine hundred forty-four million, six hundred sixty-nine thousand, eight hundred sixty-four".