77446321 has 2 divisors, whose sum is σ = 77446322. Its totient is φ = 77446320.

The previous prime is 77446289. The next prime is 77446331. The reversal of 77446321 is 12364477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62236321 + 15210000 = 7889^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 77446321 - 2⁵ = 77446289 is a prime.

It is not a weakly prime, because it can be changed into another prime (77446331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38723160 + 38723161.

It is an arithmetic number, because the mean of its divisors is an integer number (38723161).

Almost surely, 2^77446321 is an apocalyptic number.

It is an amenable number.

77446321 is a deficient number, since it is larger than the sum of its proper divisors (1).

77446321 is an equidigital number, since it uses as much as digits as its factorization.

77446321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 34.

The square root of 77446321 is about 8800.3591403988. The cubic root of 77446321 is about 426.2524916221.

The spelling of 77446321 in words is "seventy-seven million, four hundred forty-six thousand, three hundred twenty-one".