77248321 has 2 divisors, whose sum is σ = 77248322. Its totient is φ = 77248320.

The previous prime is 77248313. The next prime is 77248337. The reversal of 77248321 is 12384277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60528400 + 16719921 = 7780^2 + 4089^2 .

It is a cyclic number.

It is not a de Polignac number, because 77248321 - 2³ = 77248313 is a prime.

It is not a weakly prime, because it can be changed into another prime (77248361) 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, 38624160 + 38624161.

It is an arithmetic number, because the mean of its divisors is an integer number (38624161).

Almost surely, 2^77248321 is an apocalyptic number.

It is an amenable number.

77248321 is a deficient number, since it is larger than the sum of its proper divisors (1).

77248321 is an equidigital number, since it uses as much as digits as its factorization.

77248321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 34.

The square root of 77248321 is about 8789.1024001317. The cubic root of 77248321 is about 425.8889278925. Note that the first 3 decimals are identical.

The spelling of 77248321 in words is "seventy-seven million, two hundred forty-eight thousand, three hundred twenty-one".