764661 has 4 divisors (see below), whose sum is σ = 1019552. Its totient is φ = 509772.

The previous prime is 764657. The next prime is 764683. The reversal of 764661 is 166467.

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.

It is not a de Polignac number, because 764661 - 2² = 764657 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 764661.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127441 + ... + 127446.

It is an arithmetic number, because the mean of its divisors is an integer number (254888).

2⁷⁶⁴⁶⁶¹ is an apocalyptic number.

It is an amenable number.

764661 is a deficient number, since it is larger than the sum of its proper divisors (254891).

764661 is a wasteful number, since it uses less digits than its factorization.

764661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254890.

The product of its digits is 6048, while the sum is 30.

The square root of 764661 is about 874.4489693516. The cubic root of 764661 is about 91.4442312974. Note that the first 3 decimals are identical.

It can be divided in two parts, 76466 and 1, that added together give a palindrome (76467).

The spelling of 764661 in words is "seven hundred sixty-four thousand, six hundred sixty-one".