7220256686 has 32 divisors (see below), whose sum is σ = 11264424960. Its totient is φ = 3467318400.

The previous prime is 7220256649. The next prime is 7220256697. The reversal of 7220256686 is 6866520227.

It is a super-2 number, since 2×7220256686² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7155350 + ... + 7156358.

It is an arithmetic number, because the mean of its divisors is an integer number (352013280).

Almost surely, 2^7220256686 is an apocalyptic number.

7220256686 is a deficient number, since it is larger than the sum of its proper divisors (4044168274).

7220256686 is a wasteful number, since it uses less digits than its factorization.

7220256686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 7220256686 is about 84972.0935719487. The cubic root of 7220256686 is about 1932.7879638961.

The spelling of 7220256686 in words is "seven billion, two hundred twenty million, two hundred fifty-six thousand, six hundred eighty-six".