77000321 has 2 divisors, whose sum is σ = 77000322. Its totient is φ = 77000320.

The previous prime is 77000317. The next prime is 77000377. The reversal of 77000321 is 12300077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42719296 + 34281025 = 6536^2 + 5855^2 .

It is a cyclic number.

It is not a de Polignac number, because 77000321 - 2² = 77000317 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77000293 and 77000302.

It is not a weakly prime, because it can be changed into another prime (77000381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38500160 + 38500161.

It is an arithmetic number, because the mean of its divisors is an integer number (38500161).

Almost surely, 2^77000321 is an apocalyptic number.

It is an amenable number.

77000321 is a deficient number, since it is larger than the sum of its proper divisors (1).

77000321 is an equidigital number, since it uses as much as digits as its factorization.

77000321 is an odious number, because the sum of its binary digits is odd.

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

The square root of 77000321 is about 8774.9826780456. The cubic root of 77000321 is about 425.4326776955.

Adding to 77000321 its reverse (12300077), we get a palindrome (89300398).

The spelling of 77000321 in words is "seventy-seven million, three hundred twenty-one", and thus it is an aban number.