220890445778 has 54 divisors (see below), whose sum is σ = 357179410029. Its totient is φ = 102433006592.

The previous prime is 220890445777. The next prime is 220890445819. The reversal of 220890445778 is 877544098022.

It can be written as a sum of positive squares in 14 ways, for example, as 3340030849 + 217550414929 = 57793^2 + 466423^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332333.

It is a super-3 number, since 3×220890445778³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220890445777) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1276823300 + ... + 1276823472.

Almost surely, 2^220890445778 is an apocalyptic number.

220890445778 is a deficient number, since it is larger than the sum of its proper divisors (136288964251).

220890445778 is an equidigital number, since it uses as much as digits as its factorization.

220890445778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 220890445778 in words is "two hundred twenty billion, eight hundred ninety million, four hundred forty-five thousand, seven hundred seventy-eight".