722891285 has 4 divisors (see below), whose sum is σ = 867469548. Its totient is φ = 578313024.

The previous prime is 722891269. The next prime is 722891287. The reversal of 722891285 is 582198227.

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 576336049 + 146555236 = 24007^2 + 12106^2 .

It is a cyclic number.

It is not a de Polignac number, because 722891285 - 2⁴ = 722891269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722891287) 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, 72289124 + ... + 72289133.

It is an arithmetic number, because the mean of its divisors is an integer number (216867387).

Almost surely, 2^722891285 is an apocalyptic number.

It is an amenable number.

722891285 is a deficient number, since it is larger than the sum of its proper divisors (144578263).

722891285 is a wasteful number, since it uses less digits than its factorization.

722891285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144578262.

The product of its digits is 161280, while the sum is 44.

The square root of 722891285 is about 26886.6376663204. The cubic root of 722891285 is about 897.4790709034.

The spelling of 722891285 in words is "seven hundred twenty-two million, eight hundred ninety-one thousand, two hundred eighty-five".