765780880 has 20 divisors (see below), whose sum is σ = 1780440732. Its totient is φ = 306312320.

The previous prime is 765780871. The next prime is 765780901. The reversal of 765780880 is 88087567.

It can be written as a sum of positive squares in 2 ways, for example, as 120824064 + 644956816 = 10992^2 + 25396^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4786051 + ... + 4786210.

Almost surely, 2^765780880 is an apocalyptic number.

It is an amenable number.

765780880 is an abundant number, since it is smaller than the sum of its proper divisors (1014659852).

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

765780880 is a wasteful number, since it uses less digits than its factorization.

765780880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9572274 (or 9572268 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 49.

The square root of 765780880 is about 27672.7461593532. The cubic root of 765780880 is about 914.8885090151. Note that the first 3 decimals are identical.

The spelling of 765780880 in words is "seven hundred sixty-five million, seven hundred eighty thousand, eight hundred eighty".