77280433 has 2 divisors, whose sum is σ = 77280434. Its totient is φ = 77280432.

The previous prime is 77280431. The next prime is 77280491. The reversal of 77280433 is 33408277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58721569 + 18558864 = 7663^2 + 4308^2 .

It is a cyclic number.

It is not a de Polignac number, because 77280433 - 2¹ = 77280431 is a prime.

Together with 77280431, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77280431) 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, 38640216 + 38640217.

It is an arithmetic number, because the mean of its divisors is an integer number (38640217).

Almost surely, 2^77280433 is an apocalyptic number.

It is an amenable number.

77280433 is a deficient number, since it is larger than the sum of its proper divisors (1).

77280433 is an equidigital number, since it uses as much as digits as its factorization.

77280433 is an odious number, because the sum of its binary digits is odd.

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

The square root of 77280433 is about 8790.9290180276. The cubic root of 77280433 is about 425.9479334927.

The spelling of 77280433 in words is "seventy-seven million, two hundred eighty thousand, four hundred thirty-three".