722006641 has 4 divisors (see below), whose sum is σ = 741520372. Its totient is φ = 702492912.

The previous prime is 722006629. The next prime is 722006657. The reversal of 722006641 is 146600227.

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

It can be written as a sum of positive squares in 2 ways, for example, as 566630416 + 155376225 = 23804^2 + 12465^2 .

It is a cyclic number.

It is not a de Polignac number, because 722006641 - 2⁷ = 722006513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722006141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9756810 + ... + 9756883.

It is an arithmetic number, because the mean of its divisors is an integer number (185380093).

Almost surely, 2^722006641 is an apocalyptic number.

It is an amenable number.

722006641 is a deficient number, since it is larger than the sum of its proper divisors (19513731).

722006641 is a wasteful number, since it uses less digits than its factorization.

722006641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19513730.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 722006641 is about 26870.1812610187. The cubic root of 722006641 is about 897.1128223958.

Adding to 722006641 its reverse (146600227), we get a palindrome (868606868).

The spelling of 722006641 in words is "seven hundred twenty-two million, six thousand, six hundred forty-one".