76642321 has 20 divisors (see below), whose sum is σ = 90449892. Its totient is φ = 64934016.

The previous prime is 76642309. The next prime is 76642327. The reversal of 76642321 is 12324667.

It can be written as a sum of positive squares in 2 ways, for example, as 29582721 + 47059600 = 5439^2 + 6860^2 .

It is not a de Polignac number, because 76642321 - 2⁷ = 76642193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76642327) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 328821 + ... + 329053.

Almost surely, 2^76642321 is an apocalyptic number.

It is an amenable number.

76642321 is a deficient number, since it is larger than the sum of its proper divisors (13807571).

76642321 is an equidigital number, since it uses as much as digits as its factorization.

76642321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 377 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 76642321 is about 8754.5600117881. The cubic root of 76642321 is about 424.7723274232.

Adding to 76642321 its reverse (12324667), we get a palindrome (88966988).

The spelling of 76642321 in words is "seventy-six million, six hundred forty-two thousand, three hundred twenty-one".