999816870 has 32 divisors (see below), whose sum is σ = 2584143072. Its totient is φ = 246108672.

The previous prime is 999816799. The next prime is 999816871. The reversal of 999816870 is 78618999.

It is a self number, because there is not a number n which added to its sum of digits gives 999816870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999816871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1281427 + ... + 1282206.

It is an arithmetic number, because the mean of its divisors is an integer number (80754471).

Almost surely, 2^999816870 is an apocalyptic number.

999816870 is an abundant number, since it is smaller than the sum of its proper divisors (1584326202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999816870 is a wasteful number, since it uses less digits than its factorization.

999816870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563656.

The product of its (nonzero) digits is 1959552, while the sum is 57.

The square root of 999816870 is about 31619.8809295671. The cubic root of 999816870 is about 999.9389529400.

The spelling of 999816870 in words is "nine hundred ninety-nine million, eight hundred sixteen thousand, eight hundred seventy".