77332321 has 16 divisors (see below), whose sum is σ = 87538176. Its totient is φ = 67680000.

The previous prime is 77332319. The next prime is 77332397. The reversal of 77332321 is 12323377.

It is a cyclic number.

It is not a de Polignac number, because 77332321 - 2¹ = 77332319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77332321.

It is not an unprimeable number, because it can be changed into a prime (77332301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81711 + ... + 82651.

It is an arithmetic number, because the mean of its divisors is an integer number (5471136).

Almost surely, 2^77332321 is an apocalyptic number.

It is an amenable number.

77332321 is a deficient number, since it is larger than the sum of its proper divisors (10205855).

77332321 is a wasteful number, since it uses less digits than its factorization.

77332321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224.

The product of its digits is 5292, while the sum is 28.

The square root of 77332321 is about 8793.8797467330. The cubic root of 77332321 is about 426.0432428349.

Adding to 77332321 its reverse (12323377), we get a palindrome (89655698).

The spelling of 77332321 in words is "seventy-seven million, three hundred thirty-two thousand, three hundred twenty-one".