76663321 has 4 divisors (see below), whose sum is σ = 87615232. Its totient is φ = 65711412.

The previous prime is 76663303. The next prime is 76663333. The reversal of 76663321 is 12336667.

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 a cyclic number.

It is not a de Polignac number, because 76663321 - 2⁷ = 76663193 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (76664321) 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, 5475945 + ... + 5475958.

It is an arithmetic number, because the mean of its divisors is an integer number (21903808).

Almost surely, 2^76663321 is an apocalyptic number.

It is an amenable number.

76663321 is a deficient number, since it is larger than the sum of its proper divisors (10951911).

76663321 is a wasteful number, since it uses less digits than its factorization.

76663321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10951910.

The product of its digits is 27216, while the sum is 34.

The square root of 76663321 is about 8755.7593045949. The cubic root of 76663321 is about 424.8111197604.

Adding to 76663321 its reverse (12336667), we get a palindrome (88999988).

The spelling of 76663321 in words is "seventy-six million, six hundred sixty-three thousand, three hundred twenty-one".