77678089 has 2 divisors, whose sum is σ = 77678090. Its totient is φ = 77678088.

The previous prime is 77678063. The next prime is 77678101. The reversal of 77678089 is 98087677.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62932489 + 14745600 = 7933^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 77678089 - 2²¹ = 75580937 is a prime.

It is not a weakly prime, because it can be changed into another prime (77678989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38839044 + 38839045.

It is an arithmetic number, because the mean of its divisors is an integer number (38839045).

Almost surely, 2^77678089 is an apocalyptic number.

It is an amenable number.

77678089 is a deficient number, since it is larger than the sum of its proper divisors (1).

77678089 is an equidigital number, since it uses as much as digits as its factorization.

77678089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 77678089 is about 8813.5174022634. The cubic root of 77678089 is about 426.6772731603.

The spelling of 77678089 in words is "seventy-seven million, six hundred seventy-eight thousand, eighty-nine".