765067221 has 16 divisors (see below), whose sum is σ = 1138813120. Its totient is φ = 507623760.

The previous prime is 765067217. The next prime is 765067249. The reversal of 765067221 is 122760567.

It is not a de Polignac number, because 765067221 - 2² = 765067217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (765067921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61450 + ... + 72843.

It is an arithmetic number, because the mean of its divisors is an integer number (71175820).

Almost surely, 2^765067221 is an apocalyptic number.

It is an amenable number.

765067221 is a deficient number, since it is larger than the sum of its proper divisors (373745899).

765067221 is a wasteful number, since it uses less digits than its factorization.

765067221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134513 (or 134507 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 765067221 is about 27659.8485353771. The cubic root of 765067221 is about 914.6042147447.

The spelling of 765067221 in words is "seven hundred sixty-five million, sixty-seven thousand, two hundred twenty-one".