78881633 has 2 divisors, whose sum is σ = 78881634. Its totient is φ = 78881632.

The previous prime is 78881629. The next prime is 78881659. The reversal of 78881633 is 33618887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67436944 + 11444689 = 8212^2 + 3383^2 .

It is an emirp because it is prime and its reverse (33618887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78881633 - 2² = 78881629 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78881833) 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, 39440816 + 39440817.

It is an arithmetic number, because the mean of its divisors is an integer number (39440817).

Almost surely, 2^78881633 is an apocalyptic number.

It is an amenable number.

78881633 is a deficient number, since it is larger than the sum of its proper divisors (1).

78881633 is an equidigital number, since it uses as much as digits as its factorization.

78881633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 78881633 is about 8881.5332572704. The cubic root of 78881633 is about 428.8696343557.

The spelling of 78881633 in words is "seventy-eight million, eight hundred eighty-one thousand, six hundred thirty-three".