7647909138 has 16 divisors (see below), whose sum is σ = 16995353760. Its totient is φ = 2549303028.

The previous prime is 7647909083. The next prime is 7647909149. The reversal of 7647909138 is 8319097467.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 141627947 = 7647909138 / (7 + 6 + 4 + 7 + 9 + 0 + 9 + 1 + 3 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70813920 + ... + 70814027.

It is an arithmetic number, because the mean of its divisors is an integer number (1062209610).

Almost surely, 2^7647909138 is an apocalyptic number.

7647909138 is an abundant number, since it is smaller than the sum of its proper divisors (9347444622).

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

7647909138 is a wasteful number, since it uses less digits than its factorization.

7647909138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141627958 (or 141627952 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 7647909138 is about 87452.3249433656. The cubic root of 7647909138 is about 1970.2178066618.

The spelling of 7647909138 in words is "seven billion, six hundred forty-seven million, nine hundred nine thousand, one hundred thirty-eight".