6720906247 has 4 divisors (see below), whose sum is σ = 7331897736. Its totient is φ = 6109914760.

The previous prime is 6720906217. The next prime is 6720906253. The reversal of 6720906247 is 7426090276.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6720906247 - 2¹⁹ = 6720381959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720906217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305495728 + ... + 305495749.

It is an arithmetic number, because the mean of its divisors is an integer number (1832974434).

Almost surely, 2^6720906247 is an apocalyptic number.

6720906247 is a deficient number, since it is larger than the sum of its proper divisors (610991489).

6720906247 is a wasteful number, since it uses less digits than its factorization.

6720906247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610991488.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 6720906247 is about 81981.1334820396. The cubic root of 6720906247 is about 1887.1624175996.

The spelling of 6720906247 in words is "six billion, seven hundred twenty million, nine hundred six thousand, two hundred forty-seven".