763661 has 4 divisors (see below), whose sum is σ = 771324. Its totient is φ = 756000.

The previous prime is 763649. The next prime is 763663. The reversal of 763661 is 166367.

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 498436 + 265225 = 706^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 763661 - 2⁶ = 763597 is a prime.

It is a Duffinian number.

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 763661.

It is not an unprimeable number, because it can be changed into a prime (763663) 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, 3680 + ... + 3881.

It is an arithmetic number, because the mean of its divisors is an integer number (192831).

2⁷⁶³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

763661 is a deficient number, since it is larger than the sum of its proper divisors (7663).

763661 is a wasteful number, since it uses less digits than its factorization.

763661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7662.

The product of its digits is 4536, while the sum is 29.

The square root of 763661 is about 873.8769936324. The cubic root of 763661 is about 91.4043512621.

It can be divided in two parts, 76366 and 1, that added together give a palindrome (76367).

The spelling of 763661 in words is "seven hundred sixty-three thousand, six hundred sixty-one".