7647978740 has 24 divisors (see below), whose sum is σ = 16062574752. Its totient is φ = 3058844960.

The previous prime is 7647978739. The next prime is 7647978749. The reversal of 7647978740 is 478797467.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 7647978740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7647978749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231455 + ... + 262425.

It is an arithmetic number, because the mean of its divisors is an integer number (669273948).

Almost surely, 2^7647978740 is an apocalyptic number.

It is an amenable number.

7647978740 is an abundant number, since it is smaller than the sum of its proper divisors (8414596012).

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

7647978740 is a wasteful number, since it uses less digits than its factorization.

7647978740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43327 (or 43325 counting only the distinct ones).

The product of its (nonzero) digits is 16595712, while the sum is 59.

The square root of 7647978740 is about 87452.7228849966. The cubic root of 7647978740 is about 1970.2237834885.

The spelling of 7647978740 in words is "seven billion, six hundred forty-seven million, nine hundred seventy-eight thousand, seven hundred forty".