6978477648 has 40 divisors (see below), whose sum is σ = 18514974688. Its totient is φ = 2263289472.

The previous prime is 6978477601. The next prime is 6978477659. The reversal of 6978477648 is 8467748796.

It is a super-2 number, since 2×6978477648² = 97398300567271223808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1962886 + ... + 1966437.

Almost surely, 2^6978477648 is an apocalyptic number.

It is an amenable number.

6978477648 is an abundant number, since it is smaller than the sum of its proper divisors (11536497040).

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

6978477648 is a wasteful number, since it uses less digits than its factorization.

6978477648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929371 (or 3929365 counting only the distinct ones).

The product of its digits is 113799168, while the sum is 66.

The square root of 6978477648 is about 83537.2829819117. The cubic root of 6978477648 is about 1910.9686568035.

The spelling of 6978477648 in words is "six billion, nine hundred seventy-eight million, four hundred seventy-seven thousand, six hundred forty-eight".