80778629 has 2 divisors, whose sum is σ = 80778630. Its totient is φ = 80778628.

The previous prime is 80778587. The next prime is 80778637. The reversal of 80778629 is 92687708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77176225 + 3602404 = 8785^2 + 1898^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80778629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80778029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40389314 + 40389315.

It is an arithmetic number, because the mean of its divisors is an integer number (40389315).

Almost surely, 2^80778629 is an apocalyptic number.

It is an amenable number.

80778629 is a deficient number, since it is larger than the sum of its proper divisors (1).

80778629 is an equidigital number, since it uses as much as digits as its factorization.

80778629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 80778629 is about 8987.6931968108. The cubic root of 80778629 is about 432.2803482201.

The spelling of 80778629 in words is "eighty million, seven hundred seventy-eight thousand, six hundred twenty-nine".