2128705645 has 16 divisors (see below), whose sum is σ = 2861987328. Its totient is φ = 1506306240.

The previous prime is 2128705619. The next prime is 2128705681. The reversal of 2128705645 is 5465078212.

It is not a de Polignac number, because 2128705645 - 2²¹ = 2126608493 is a prime.

It is a super-3 number, since 3×2128705645³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2128705598 and 2128705607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520989 + ... + 525058.

It is an arithmetic number, because the mean of its divisors is an integer number (178874208).

Almost surely, 2^2128705645 is an apocalyptic number.

It is an amenable number.

2128705645 is a deficient number, since it is larger than the sum of its proper divisors (733281683).

2128705645 is a wasteful number, since it uses less digits than its factorization.

2128705645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046100.

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 2128705645 is about 46137.8981424165. The cubic root of 2128705645 is about 1286.3876756089.

The spelling of 2128705645 in words is "two billion, one hundred twenty-eight million, seven hundred five thousand, six hundred forty-five".