98777779 has 2 divisors, whose sum is σ = 98777780. Its totient is φ = 98777778.

The previous prime is 98777771. The next prime is 98777821. The reversal of 98777779 is 97777789.

It is a weak prime.

It is an emirp because it is prime and its reverse (97777789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98777779 - 2³ = 98777771 is a prime.

It is not a weakly prime, because it can be changed into another prime (98777771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49388889 + 49388890.

It is an arithmetic number, because the mean of its divisors is an integer number (49388890).

Almost surely, 2^98777779 is an apocalyptic number.

98777779 is a deficient number, since it is larger than the sum of its proper divisors (1).

98777779 is an equidigital number, since it uses as much as digits as its factorization.

98777779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10890936, while the sum is 61.

The square root of 98777779 is about 9938.7010720717. The cubic root of 98777779 is about 462.2601107066.

The spelling of 98777779 in words is "ninety-eight million, seven hundred seventy-seven thousand, seven hundred seventy-nine".