6784742656 has 18 divisors (see below), whose sum is σ = 13542982922. Its totient is φ = 3392371200.

The previous prime is 6784742641. The next prime is 6784742663. The reversal of 6784742656 is 6562474876.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6397440256 + 387302400 = 79984^2 + 19680^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6784742597 and 6784742606.

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, 13251195 + ... + 13251706.

Almost surely, 2^6784742656 is an apocalyptic number.

It is an amenable number.

6784742656 is a deficient number, since it is larger than the sum of its proper divisors (6758240266).

6784742656 is an equidigital number, since it uses as much as digits as its factorization.

6784742656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26502917 (or 26502903 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 55.

The square root of 6784742656 is about 82369.5493249781. The cubic root of 6784742656 is about 1893.1184723888.

The spelling of 6784742656 in words is "six billion, seven hundred eighty-four million, seven hundred forty-two thousand, six hundred fifty-six".