1722123328 has 28 divisors (see below), whose sum is σ = 3500693532. Its totient is φ = 840058880.

The previous prime is 1722123317. The next prime is 1722123331. The reversal of 1722123328 is 8233212271.

It can be written as a sum of positive squares in 2 ways, for example, as 272646144 + 1449477184 = 16512^2 + 38072^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1722123328.

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, 325525 + ... + 330772.

It is an arithmetic number, because the mean of its divisors is an integer number (125024769).

Almost surely, 2^1722123328 is an apocalyptic number.

It is an amenable number.

1722123328 is an abundant number, since it is smaller than the sum of its proper divisors (1778570204).

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

1722123328 is an equidigital number, since it uses as much as digits as its factorization.

1722123328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656350 (or 656340 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 1722123328 is about 41498.4738032617. The cubic root of 1722123328 is about 1198.6381142333.

Adding to 1722123328 its reverse (8233212271), we get a palindrome (9955335599).

The spelling of 1722123328 in words is "one billion, seven hundred twenty-two million, one hundred twenty-three thousand, three hundred twenty-eight".