99998777 has 12 divisors (see below), whose sum is σ = 109424628. Its totient is φ = 91065600.

The previous prime is 99998749. The next prime is 99998783. The reversal of 99998777 is 77789999.

It can be written as a sum of positive squares in 2 ways, for example, as 42784681 + 57214096 = 6541^2 + 7564^2 .

It is a de Polignac number, because none of the positive numbers 2^k-99998777 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99998797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13277 + ... + 19397.

It is an arithmetic number, because the mean of its divisors is an integer number (9118719).

Almost surely, 2^99998777 is an apocalyptic number.

It is an amenable number.

99998777 is a deficient number, since it is larger than the sum of its proper divisors (9425851).

99998777 is a wasteful number, since it uses less digits than its factorization.

99998777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6200 (or 6169 counting only the distinct ones).

The product of its digits is 18003384, while the sum is 65.

The square root of 99998777 is about 9999.9388498130. The cubic root of 99998777 is about 464.1569911325.

The spelling of 99998777 in words is "ninety-nine million, nine hundred ninety-eight thousand, seven hundred seventy-seven".