98778899 has 2 divisors, whose sum is σ = 98778900. Its totient is φ = 98778898.

The previous prime is 98778893. The next prime is 98778917. The reversal of 98778899 is 99887789.

It is a weak prime.

It is an emirp because it is prime and its reverse (99887789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98778899 - 2²⁴ = 82001683 is a prime.

It is not a weakly prime, because it can be changed into another prime (98778893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49389449 + 49389450.

It is an arithmetic number, because the mean of its divisors is an integer number (49389450).

Almost surely, 2^98778899 is an apocalyptic number.

98778899 is a deficient number, since it is larger than the sum of its proper divisors (1).

98778899 is an equidigital number, since it uses as much as digits as its factorization.

98778899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 65.

The square root of 98778899 is about 9938.7574173032. The cubic root of 98778899 is about 462.2618578248.

The spelling of 98778899 in words is "ninety-eight million, seven hundred seventy-eight thousand, eight hundred ninety-nine".