765161220 has 96 divisors (see below), whose sum is σ = 2234889216. Its totient is φ = 195379200.

The previous prime is 765161209. The next prime is 765161227. The reversal of 765161220 is 22161567.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (765161227) 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, 178300 + ... + 182540.

It is an arithmetic number, because the mean of its divisors is an integer number (23280096).

Almost surely, 2^765161220 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 765161220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1117444608).

765161220 is an abundant number, since it is smaller than the sum of its proper divisors (1469727996).

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

765161220 is a wasteful number, since it uses less digits than its factorization.

765161220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381 (or 4379 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 765161220 is about 27661.5476790436. The cubic root of 765161220 is about 914.6416704342.

The spelling of 765161220 in words is "seven hundred sixty-five million, one hundred sixty-one thousand, two hundred twenty".