6721235778 has 16 divisors (see below), whose sum is σ = 13506182496. Its totient is φ = 2229793440.

The previous prime is 6721235771. The next prime is 6721235797. The reversal of 6721235778 is 8775321276.

It is not an unprimeable number, because it can be changed into a prime (6721235771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2653251 + ... + 2655782.

It is an arithmetic number, because the mean of its divisors is an integer number (844136406).

Almost surely, 2^6721235778 is an apocalyptic number.

6721235778 is an abundant number, since it is smaller than the sum of its proper divisors (6784946718).

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

6721235778 is a wasteful number, since it uses less digits than its factorization.

6721235778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5309249.

The product of its digits is 987840, while the sum is 48.

The square root of 6721235778 is about 81983.1432551839. The cubic root of 6721235778 is about 1887.1932600849.

The spelling of 6721235778 in words is "six billion, seven hundred twenty-one million, two hundred thirty-five thousand, seven hundred seventy-eight".