721790068 has 6 divisors (see below), whose sum is σ = 1263132626. Its totient is φ = 360895032.

The previous prime is 721790059. The next prime is 721790119. The reversal of 721790068 is 860097127.

It can be written as a sum of positive squares in only one way, i.e., 364504464 + 357285604 = 19092^2 + 18902^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 721790068.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 90223755 + ... + 90223762.

Almost surely, 2^721790068 is an apocalyptic number.

It is an amenable number.

721790068 is a deficient number, since it is larger than the sum of its proper divisors (541342558).

721790068 is a wasteful number, since it uses less digits than its factorization.

721790068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180447521 (or 180447519 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 721790068 is about 26866.1509710639. The cubic root of 721790068 is about 897.0231141512.

The spelling of 721790068 in words is "seven hundred twenty-one million, seven hundred ninety thousand, sixty-eight".