6647940480 has 64 divisors (see below), whose sum is σ = 21190316400. Its totient is φ = 1772783616.

The previous prime is 6647940469. The next prime is 6647940499. The reversal of 6647940480 is 840497466.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×6647940480² = 88390225251245260800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 1729315 + ... + 1733154.

Almost surely, 2^6647940480 is an apocalyptic number.

6647940480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6647940480 is an abundant number, since it is smaller than the sum of its proper divisors (14542375920).

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

6647940480 is a wasteful number, since it uses less digits than its factorization.

6647940480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3462491 (or 3462479 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 6647940480 is about 81534.9034463156. The cubic root of 6647940480 is about 1880.3082035829.

The spelling of 6647940480 in words is "six billion, six hundred forty-seven million, nine hundred forty thousand, four hundred eighty".