1995778908 has 36 divisors (see below), whose sum is σ = 5264230608. Its totient is φ = 636335040.

The previous prime is 1995778891. The next prime is 1995778921. The reversal of 1995778908 is 8098775991.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1204353 + ... + 1206008.

It is an arithmetic number, because the mean of its divisors is an integer number (146228628).

Almost surely, 2^1995778908 is an apocalyptic number.

1995778908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1995778908 is an abundant number, since it is smaller than the sum of its proper divisors (3268451700).

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

1995778908 is a wasteful number, since it uses less digits than its factorization.

1995778908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410394 (or 2410389 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 63.

The square root of 1995778908 is about 44674.1413795498. The cubic root of 1995778908 is about 1259.0340518077.

The spelling of 1995778908 in words is "one billion, nine hundred ninety-five million, seven hundred seventy-eight thousand, nine hundred eight".