1909995648 has 256 divisors, whose sum is σ = 5787953280. Its totient is φ = 557568000.

The previous prime is 1909995643. The next prime is 1909995649. The reversal of 1909995648 is 8465999091.

It is a junction number, because it is equal to n+sod(n) for n = 1909995591 and 1909995600.

It is not an unprimeable number, because it can be changed into a prime (1909995643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18910798 + ... + 18910898.

Almost surely, 2^1909995648 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 1909995648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2893976640).

1909995648 is an abundant number, since it is smaller than the sum of its proper divisors (3877957632).

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

1909995648 is a wasteful number, since it uses less digits than its factorization.

1909995648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 60.

The square root of 1909995648 is about 43703.4969767867. The cubic root of 1909995648 is about 1240.7305026213.

The spelling of 1909995648 in words is "one billion, nine hundred nine million, nine hundred ninety-five thousand, six hundred forty-eight".