78905077 has 2 divisors, whose sum is σ = 78905078. Its totient is φ = 78905076.

The previous prime is 78905063. The next prime is 78905089. The reversal of 78905077 is 77050987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44635761 + 34269316 = 6681^2 + 5854^2 .

It is a cyclic number.

It is not a de Polignac number, because 78905077 - 2⁷ = 78904949 is a prime.

It is a super-2 number, since 2×78905077² = 12452022352751858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78905017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39452538 + 39452539.

It is an arithmetic number, because the mean of its divisors is an integer number (39452539).

Almost surely, 2^78905077 is an apocalyptic number.

It is an amenable number.

78905077 is a deficient number, since it is larger than the sum of its proper divisors (1).

78905077 is an equidigital number, since it uses as much as digits as its factorization.

78905077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123480, while the sum is 43.

The square root of 78905077 is about 8882.8529763810. The cubic root of 78905077 is about 428.9121175187.

The spelling of 78905077 in words is "seventy-eight million, nine hundred five thousand, seventy-seven".