2078999999 has 4 divisors (see below), whose sum is σ = 2094870360. Its totient is φ = 2063129640.

The previous prime is 2078999981. The next prime is 2079000031. The reversal of 2078999999 is 9999998702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2078999999 - 2¹⁶ = 2078934463 is a prime.

It is a Duffinian number.

2078999999 is a modest number, since divided by 99999 gives 20789 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2078999929) 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, 7934984 + ... + 7935245.

It is an arithmetic number, because the mean of its divisors is an integer number (523717590).

Almost surely, 2^2078999999 is an apocalyptic number.

2078999999 is a deficient number, since it is larger than the sum of its proper divisors (15870361).

2078999999 is a wasteful number, since it uses less digits than its factorization.

2078999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15870360.

The product of its (nonzero) digits is 59521392, while the sum is 71.

The square root of 2078999999 is about 45596.0524497461. The cubic root of 2078999999 is about 1276.2962593299.

The spelling of 2078999999 in words is "two billion, seventy-eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".