77321 has 4 divisors (see below), whose sum is σ = 77952. Its totient is φ = 76692.

The previous prime is 77317. The next prime is 77323. The reversal of 77321 is 12377.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 77321 - 2² = 77317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 77293 and 77302.

It is not an unprimeable number, because it can be changed into a prime (77323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65 + ... + 398.

It is an arithmetic number, because the mean of its divisors is an integer number (19488).

2⁷⁷³²¹ is an apocalyptic number.

It is an amenable number.

77321 is a deficient number, since it is larger than the sum of its proper divisors (631).

77321 is a wasteful number, since it uses less digits than its factorization.

77321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630.

The product of its digits is 294, while the sum is 20.

The square root of 77321 is about 278.0665387996. The cubic root of 77321 is about 42.6022451740.

Adding to 77321 its reverse (12377), we get a palindrome (89698).

The spelling of 77321 in words is "seventy-seven thousand, three hundred twenty-one", and thus it is an iban number.