7788478648 has 8 divisors (see below), whose sum is σ = 14603397480. Its totient is φ = 3894239320.

The previous prime is 7788478639. The next prime is 7788478669. The reversal of 7788478648 is 8468748877.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486779908 + ... + 486779923.

It is an arithmetic number, because the mean of its divisors is an integer number (1825424685).

Almost surely, 2^7788478648 is an apocalyptic number.

It is an amenable number.

7788478648 is a deficient number, since it is larger than the sum of its proper divisors (6814918832).

7788478648 is a wasteful number, since it uses less digits than its factorization.

7788478648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973559837 (or 973559833 counting only the distinct ones).

The product of its digits is 134873088, while the sum is 67.

The square root of 7788478648 is about 88252.3577475412. The cubic root of 7788478648 is about 1982.2155460139.

The spelling of 7788478648 in words is "seven billion, seven hundred eighty-eight million, four hundred seventy-eight thousand, six hundred forty-eight".