721428726 has 8 divisors (see below), whose sum is σ = 1442857464. Its totient is φ = 240476240.

The previous prime is 721428703. The next prime is 721428791. The reversal of 721428726 is 627824127.

It is a sphenic number, since it is the product of 3 distinct primes.

721428726 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60119055 + ... + 60119066.

It is an arithmetic number, because the mean of its divisors is an integer number (180357183).

Almost surely, 2^721428726 is an apocalyptic number.

721428726 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

721428726 is a wasteful number, since it uses less digits than its factorization.

721428726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120238126.

The product of its digits is 75264, while the sum is 39.

The square root of 721428726 is about 26859.4252730769. The cubic root of 721428726 is about 896.8734001534.

The spelling of 721428726 in words is "seven hundred twenty-one million, four hundred twenty-eight thousand, seven hundred twenty-six".