722664385 has 4 divisors (see below), whose sum is σ = 867197268. Its totient is φ = 578131504.

The previous prime is 722664379. The next prime is 722664389. The reversal of 722664385 is 583466227.

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 357701569 + 364962816 = 18913^2 + 19104^2 .

It is a cyclic number.

It is not a de Polignac number, because 722664385 - 2⁹ = 722663873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722664389) 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, 72266434 + ... + 72266443.

It is an arithmetic number, because the mean of its divisors is an integer number (216799317).

Almost surely, 2^722664385 is an apocalyptic number.

It is an amenable number.

722664385 is a deficient number, since it is larger than the sum of its proper divisors (144532883).

722664385 is a wasteful number, since it uses less digits than its factorization.

722664385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144532882.

The product of its digits is 483840, while the sum is 43.

The square root of 722664385 is about 26882.4177670090. The cubic root of 722664385 is about 897.3851612958.

The spelling of 722664385 in words is "seven hundred twenty-two million, six hundred sixty-four thousand, three hundred eighty-five".