6783440064 has 56 divisors (see below), whose sum is σ = 18329745408. Its totient is φ = 2213034240.

The previous prime is 6783440033. The next prime is 6783440077. The reversal of 6783440064 is 4600443876.

It is a junction number, because it is equal to n+sod(n) for n = 6783439998 and 6783440025.

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, 366832 + ... + 384879.

Almost surely, 2^6783440064 is an apocalyptic number.

6783440064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6783440064 is an abundant number, since it is smaller than the sum of its proper divisors (11546305344).

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

6783440064 is a wasteful number, since it uses less digits than its factorization.

6783440064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751773 (or 751763 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The square root of 6783440064 is about 82361.6419457505. The cubic root of 6783440064 is about 1892.9973123620.

The spelling of 6783440064 in words is "six billion, seven hundred eighty-three million, four hundred forty thousand, sixty-four".