78422077 has 2 divisors, whose sum is σ = 78422078. Its totient is φ = 78422076.

The previous prime is 78422059. The next prime is 78422087. The reversal of 78422077 is 77022487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75794436 + 2627641 = 8706^2 + 1621^2 .

It is a cyclic number.

It is not a de Polignac number, because 78422077 - 2¹¹ = 78420029 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 (78422087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39211038 + 39211039.

It is an arithmetic number, because the mean of its divisors is an integer number (39211039).

Almost surely, 2^78422077 is an apocalyptic number.

It is an amenable number.

78422077 is a deficient number, since it is larger than the sum of its proper divisors (1).

78422077 is an equidigital number, since it uses as much as digits as its factorization.

78422077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43904, while the sum is 37.

The square root of 78422077 is about 8855.6240322182. The cubic root of 78422077 is about 428.0351621183.

The spelling of 78422077 in words is "seventy-eight million, four hundred twenty-two thousand, seventy-seven".