775803648 has 72 divisors (see below), whose sum is σ = 2076548656. Its totient is φ = 257126400.

The previous prime is 775803643. The next prime is 775803661. The reversal of 775803648 is 846308577.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 775803597 and 775803606.

It is not an unprimeable number, because it can be changed into a prime (775803641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136218 + ... + 141798.

Almost surely, 2^775803648 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 775803648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038274328).

775803648 is an abundant number, since it is smaller than the sum of its proper divisors (1300745008).

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

775803648 is a wasteful number, since it uses less digits than its factorization.

775803648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5781 (or 5767 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The square root of 775803648 is about 27853.2520183910. The cubic root of 775803648 is about 918.8626651413.

The spelling of 775803648 in words is "seven hundred seventy-five million, eight hundred three thousand, six hundred forty-eight".