77221673 has 2 divisors, whose sum is σ = 77221674. Its totient is φ = 77221672.

The previous prime is 77221637. The next prime is 77221691. The reversal of 77221673 is 37612277.

Together with previous prime (77221637) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56355049 + 20866624 = 7507^2 + 4568^2 .

It is a cyclic number.

It is not a de Polignac number, because 77221673 - 2¹⁸ = 76959529 is a prime.

It is not a weakly prime, because it can be changed into another prime (77227673) 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, 38610836 + 38610837.

It is an arithmetic number, because the mean of its divisors is an integer number (38610837).

Almost surely, 2^77221673 is an apocalyptic number.

It is an amenable number.

77221673 is a deficient number, since it is larger than the sum of its proper divisors (1).

77221673 is an equidigital number, since it uses as much as digits as its factorization.

77221673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24696, while the sum is 35.

The square root of 77221673 is about 8787.5863011409. The cubic root of 77221673 is about 425.8399499416.

The spelling of 77221673 in words is "seventy-seven million, two hundred twenty-one thousand, six hundred seventy-three".