722906686 has 4 divisors (see below), whose sum is σ = 1084360032. Its totient is φ = 361453342.

The previous prime is 722906651. The next prime is 722906689. The reversal of 722906686 is 686609227.

It is a happy number.

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

It is a super-3 number, since 3×722906686³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722906689) 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 as a sum of consecutive naturals, namely, 180726670 + ... + 180726673.

It is an arithmetic number, because the mean of its divisors is an integer number (271090008).

Almost surely, 2^722906686 is an apocalyptic number.

722906686 is a deficient number, since it is larger than the sum of its proper divisors (361453346).

722906686 is a wasteful number, since it uses less digits than its factorization.

722906686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361453345.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 722906686 is about 26886.9240710052. The cubic root of 722906686 is about 897.4854443730.

The spelling of 722906686 in words is "seven hundred twenty-two million, nine hundred six thousand, six hundred eighty-six".