6447984904 has 16 divisors (see below), whose sum is σ = 12090855420. Its totient is φ = 3223756800.

The previous prime is 6447984833. The next prime is 6447984923. The reversal of 6447984904 is 4094897446.

It can be written as a sum of positive squares in 2 ways, for example, as 4511808900 + 1936176004 = 67170^2 + 44002^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154152 + ... + 191464.

Almost surely, 2^6447984904 is an apocalyptic number.

It is an amenable number.

6447984904 is a deficient number, since it is larger than the sum of its proper divisors (5642870516).

6447984904 is a wasteful number, since it uses less digits than its factorization.

6447984904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58920 (or 58916 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 55.

The square root of 6447984904 is about 80299.3456013186. The cubic root of 6447984904 is about 1861.2641138889.

The spelling of 6447984904 in words is "six billion, four hundred forty-seven million, nine hundred eighty-four thousand, nine hundred four".