7129894664 has 16 divisors (see below), whose sum is σ = 13518762300. Its totient is φ = 3524891392.

The previous prime is 7129894661. The next prime is 7129894691. The reversal of 7129894664 is 4664989217.

It can be written as a sum of positive squares in 2 ways, for example, as 7098062500 + 31832164 = 84250^2 + 5642^2 .

It is not an unprimeable number, because it can be changed into a prime (7129894661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5006237 + ... + 5007660.

Almost surely, 2^7129894664 is an apocalyptic number.

It is an amenable number.

7129894664 is a deficient number, since it is larger than the sum of its proper divisors (6388867636).

7129894664 is a wasteful number, since it uses less digits than its factorization.

7129894664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10013992 (or 10013988 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 56.

The square root of 7129894664 is about 84438.7035902376. The cubic root of 7129894664 is about 1924.6910991606.

The spelling of 7129894664 in words is "seven billion, one hundred twenty-nine million, eight hundred ninety-four thousand, six hundred sixty-four".