80778667 has 2 divisors, whose sum is σ = 80778668. Its totient is φ = 80778666.

The previous prime is 80778647. The next prime is 80778673. The reversal of 80778667 is 76687708.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80778667 - 2⁷ = 80778539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80778667.

It is not a weakly prime, because it can be changed into another prime (80778637) 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, 40389333 + 40389334.

It is an arithmetic number, because the mean of its divisors is an integer number (40389334).

Almost surely, 2^80778667 is an apocalyptic number.

80778667 is a deficient number, since it is larger than the sum of its proper divisors (1).

80778667 is an equidigital number, since it uses as much as digits as its factorization.

80778667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 49.

The square root of 80778667 is about 8987.6953108124. The cubic root of 80778667 is about 432.2804160047.

The spelling of 80778667 in words is "eighty million, seven hundred seventy-eight thousand, six hundred sixty-seven".