764641 has 4 divisors (see below), whose sum is σ = 774400. Its totient is φ = 754884.

The previous prime is 764629. The next prime is 764657. The reversal of 764641 is 146467.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146467 = 149 ⋅983.

It is a cyclic number.

It is not a de Polignac number, because 764641 - 2¹⁷ = 633569 is a prime.

It is a Duffinian number.

764641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (764611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4761 + ... + 4918.

It is an arithmetic number, because the mean of its divisors is an integer number (193600).

2⁷⁶⁴⁶⁴¹ is an apocalyptic number.

It is an amenable number.

764641 is a deficient number, since it is larger than the sum of its proper divisors (9759).

764641 is an equidigital number, since it uses as much as digits as its factorization.

764641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9758.

The product of its digits is 4032, while the sum is 28.

The square root of 764641 is about 874.4375335037. The cubic root of 764641 is about 91.4434340375.

The spelling of 764641 in words is "seven hundred sixty-four thousand, six hundred forty-one".