7831220656 has 20 divisors (see below), whose sum is σ = 17340560272. Its totient is φ = 3356237376.

The previous prime is 7831220653. The next prime is 7831220701. The reversal of 7831220656 is 6560221387.

It is a super-2 number, since 2×7831220656² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7831220653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34960695 + ... + 34960918.

Almost surely, 2^7831220656 is an apocalyptic number.

It is an amenable number.

7831220656 is an abundant number, since it is smaller than the sum of its proper divisors (9509339616).

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

7831220656 is a wasteful number, since it uses less digits than its factorization.

7831220656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69921628 (or 69921622 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 7831220656 is about 88494.1843060887. The cubic root of 7831220656 is about 1985.8349674419.

The spelling of 7831220656 in words is "seven billion, eight hundred thirty-one million, two hundred twenty thousand, six hundred fifty-six".