2099864678 has 4 divisors (see below), whose sum is σ = 3149797020. Its totient is φ = 1049932338.

The previous prime is 2099864677. The next prime is 2099864687. The reversal of 2099864678 is 8764689902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2099864677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 524966168 + ... + 524966171.

It is an arithmetic number, because the mean of its divisors is an integer number (787449255).

Almost surely, 2^2099864678 is an apocalyptic number.

2099864678 is a deficient number, since it is larger than the sum of its proper divisors (1049932342).

2099864678 is a wasteful number, since it uses less digits than its factorization.

2099864678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049932341.

The product of its (nonzero) digits is 10450944, while the sum is 59.

The square root of 2099864678 is about 45824.2804417047. The cubic root of 2099864678 is about 1280.5516579627.

The spelling of 2099864678 in words is "two billion, ninety-nine million, eight hundred sixty-four thousand, six hundred seventy-eight".