765728228 has 12 divisors (see below), whose sum is σ = 1351883820. Its totient is φ = 379475712.

The previous prime is 765728191. The next prime is 765728231. The reversal of 765728228 is 822827567.

It can be written as a sum of positive squares in 2 ways, for example, as 153561664 + 612166564 = 12392^2 + 24742^2 .

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, 846593 + ... + 847496.

It is an arithmetic number, because the mean of its divisors is an integer number (112656985).

Almost surely, 2^765728228 is an apocalyptic number.

It is an amenable number.

765728228 is a deficient number, since it is larger than the sum of its proper divisors (586155592).

765728228 is a wasteful number, since it uses less digits than its factorization.

765728228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694206 (or 1694204 counting only the distinct ones).

The product of its digits is 752640, while the sum is 47.

The square root of 765728228 is about 27671.7948098782. The cubic root of 765728228 is about 914.8675405217.

The spelling of 765728228 in words is "seven hundred sixty-five million, seven hundred twenty-eight thousand, two hundred twenty-eight".