76610221 has 4 divisors (see below), whose sum is σ = 77471100. Its totient is φ = 75749344.

The previous prime is 76610213. The next prime is 76610227. The reversal of 76610221 is 12201667.

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 11485321 + 65124900 = 3389^2 + 8070^2 .

It is a cyclic number.

It is not a de Polignac number, because 76610221 - 2³ = 76610213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76610227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430306 + ... + 430483.

It is an arithmetic number, because the mean of its divisors is an integer number (19367775).

Almost surely, 2^76610221 is an apocalyptic number.

It is an amenable number.

76610221 is a deficient number, since it is larger than the sum of its proper divisors (860879).

76610221 is an equidigital number, since it uses as much as digits as its factorization.

76610221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860878.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 76610221 is about 8752.7264895003. The cubic root of 76610221 is about 424.7130168683.

Adding to 76610221 its reverse (12201667), we get a palindrome (88811888).

The spelling of 76610221 in words is "seventy-six million, six hundred ten thousand, two hundred twenty-one".