77984089 has 2 divisors, whose sum is σ = 77984090. Its totient is φ = 77984088.

The previous prime is 77984077. The next prime is 77984107. The reversal of 77984089 is 98048977.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77580864 + 403225 = 8808^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 77984089 - 2¹⁹ = 77459801 is a prime.

It is not a weakly prime, because it can be changed into another prime (77984029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38992044 + 38992045.

It is an arithmetic number, because the mean of its divisors is an integer number (38992045).

Almost surely, 2^77984089 is an apocalyptic number.

It is an amenable number.

77984089 is a deficient number, since it is larger than the sum of its proper divisors (1).

77984089 is an equidigital number, since it uses as much as digits as its factorization.

77984089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 77984089 is about 8830.8600373916. The cubic root of 77984089 is about 427.2368139410.

The spelling of 77984089 in words is "seventy-seven million, nine hundred eighty-four thousand, eighty-nine".