2169978036 has 12 divisors (see below), whose sum is σ = 5063282112. Its totient is φ = 723326008.

The previous prime is 2169978017. The next prime is 2169978047. The reversal of 2169978036 is 6308799612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 2169978036.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90415740 + ... + 90415763.

It is an arithmetic number, because the mean of its divisors is an integer number (421940176).

Almost surely, 2^2169978036 is an apocalyptic number.

It is an amenable number.

2169978036 is an abundant number, since it is smaller than the sum of its proper divisors (2893304076).

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

2169978036 is a wasteful number, since it uses less digits than its factorization.

2169978036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180831510 (or 180831508 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 2169978036 is about 46583.0230448819. The cubic root of 2169978036 is about 1294.6482223550.

The spelling of 2169978036 in words is "two billion, one hundred sixty-nine million, nine hundred seventy-eight thousand, thirty-six".