2078321689 has 4 divisors (see below), whose sum is σ = 2200575924. Its totient is φ = 1956067456.

The previous prime is 2078321671. The next prime is 2078321711. The reversal of 2078321689 is 9861238702.

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 746655625 + 1331666064 = 27325^2 + 36492^2 .

It is a cyclic number.

It is not a de Polignac number, because 2078321689 - 2⁵ = 2078321657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2078321629) 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, 61127092 + ... + 61127125.

It is an arithmetic number, because the mean of its divisors is an integer number (550143981).

Almost surely, 2^2078321689 is an apocalyptic number.

It is an amenable number.

2078321689 is a deficient number, since it is larger than the sum of its proper divisors (122254235).

2078321689 is a wasteful number, since it uses less digits than its factorization.

2078321689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122254234.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 2078321689 is about 45588.6135893602. The cubic root of 2078321689 is about 1276.1574395951.

The spelling of 2078321689 in words is "two billion, seventy-eight million, three hundred twenty-one thousand, six hundred eighty-nine".