765565650 has 72 divisors (see below), whose sum is σ = 2062094580. Its totient is φ = 203627520.

The previous prime is 765565609. The next prime is 765565663. The reversal of 765565650 is 56565567.

765565650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 37051569 + 728514081 = 6087^2 + 26991^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 765565596 and 765565605.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 192886 + ... + 196814.

Almost surely, 2^765565650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 765565650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031047290).

765565650 is an abundant number, since it is smaller than the sum of its proper divisors (1296528930).

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

765565650 is a wasteful number, since it uses less digits than its factorization.

765565650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380 (or 4372 counting only the distinct ones).

The product of its (nonzero) digits is 945000, while the sum is 45.

The square root of 765565650 is about 27668.8570418079. The cubic root of 765565650 is about 914.8027882779.

The spelling of 765565650 in words is "seven hundred sixty-five million, five hundred sixty-five thousand, six hundred fifty".