77728733 has 2 divisors, whose sum is σ = 77728734. Its totient is φ = 77728732.

The previous prime is 77728723. The next prime is 77728751. The reversal of 77728733 is 33782777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76702564 + 1026169 = 8758^2 + 1013^2 .

It is a cyclic number.

It is not a de Polignac number, because 77728733 - 2¹² = 77724637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77728723) 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, 38864366 + 38864367.

It is an arithmetic number, because the mean of its divisors is an integer number (38864367).

Almost surely, 2^77728733 is an apocalyptic number.

It is an amenable number.

77728733 is a deficient number, since it is larger than the sum of its proper divisors (1).

77728733 is an equidigital number, since it uses as much as digits as its factorization.

77728733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345744, while the sum is 44.

The square root of 77728733 is about 8816.3900208645. The cubic root of 77728733 is about 426.7699803390.

The spelling of 77728733 in words is "seventy-seven million, seven hundred twenty-eight thousand, seven hundred thirty-three".