767428561 has 4 divisors (see below), whose sum is σ = 774469300. Its totient is φ = 760387824.

The previous prime is 767428559. The next prime is 767428573. The reversal of 767428561 is 165824767.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 293060161 + 474368400 = 17119^2 + 21780^2 .

It is a cyclic number.

It is not a de Polignac number, because 767428561 - 2¹ = 767428559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (767428531) 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 in 3 ways as a sum of consecutive naturals, for example, 3520206 + ... + 3520423.

It is an arithmetic number, because the mean of its divisors is an integer number (193617325).

Almost surely, 2^767428561 is an apocalyptic number.

It is an amenable number.

767428561 is a deficient number, since it is larger than the sum of its proper divisors (7040739).

767428561 is a wasteful number, since it uses less digits than its factorization.

767428561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040738.

The product of its digits is 564480, while the sum is 46.

The square root of 767428561 is about 27702.5009881779. The cubic root of 767428561 is about 915.5442076997.

The spelling of 767428561 in words is "seven hundred sixty-seven million, four hundred twenty-eight thousand, five hundred sixty-one".