1722428845 has 4 divisors (see below), whose sum is σ = 2066914620. Its totient is φ = 1377943072.

The previous prime is 1722428839. The next prime is 1722428857. The reversal of 1722428845 is 5488242271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5488242271 = 3539 ⋅1550789.

It can be written as a sum of positive squares in 2 ways, for example, as 368409636 + 1354019209 = 19194^2 + 36797^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722428845 - 2⁹ = 1722428333 is a prime.

It is a super-2 number, since 2×1722428845² = 5933522252176068050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172242880 + ... + 172242889.

It is an arithmetic number, because the mean of its divisors is an integer number (516728655).

Almost surely, 2^1722428845 is an apocalyptic number.

It is an amenable number.

1722428845 is a deficient number, since it is larger than the sum of its proper divisors (344485775).

1722428845 is an equidigital number, since it uses as much as digits as its factorization.

1722428845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344485774.

The product of its digits is 286720, while the sum is 43.

The square root of 1722428845 is about 41502.1547030995. The cubic root of 1722428845 is about 1198.7089923679.

The spelling of 1722428845 in words is "one billion, seven hundred twenty-two million, four hundred twenty-eight thousand, eight hundred forty-five".