1985767808 has 64 divisors (see below), whose sum is σ = 4104378000. Its totient is φ = 955852800.

The previous prime is 1985767799. The next prime is 1985767873. The reversal of 1985767808 is 8087675891.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1888883 + ... + 1889933.

Almost surely, 2^1985767808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1985767808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2052189000).

1985767808 is an abundant number, since it is smaller than the sum of its proper divisors (2118610192).

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

1985767808 is a wasteful number, since it uses less digits than its factorization.

1985767808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603 (or 1591 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 59.

The square root of 1985767808 is about 44561.9547147564. The cubic root of 1985767808 is about 1256.9253596970.

The spelling of 1985767808 in words is "one billion, nine hundred eighty-five million, seven hundred sixty-seven thousand, eight hundred eight".