765046721 has 2 divisors, whose sum is σ = 765046722. Its totient is φ = 765046720.

The previous prime is 765046697. The next prime is 765046727. The reversal of 765046721 is 127640567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504676225 + 260370496 = 22465^2 + 16136^2 .

It is a cyclic number.

It is not a de Polignac number, because 765046721 - 2⁶ = 765046657 is a prime.

It is a super-3 number, since 3×765046721³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (765046727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382523360 + 382523361.

It is an arithmetic number, because the mean of its divisors is an integer number (382523361).

Almost surely, 2^765046721 is an apocalyptic number.

It is an amenable number.

765046721 is a deficient number, since it is larger than the sum of its proper divisors (1).

765046721 is an equidigital number, since it uses as much as digits as its factorization.

765046721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 765046721 is about 27659.4779596434. The cubic root of 765046721 is about 914.5960457222.

The spelling of 765046721 in words is "seven hundred sixty-five million, forty-six thousand, seven hundred twenty-one".