99778498 has 4 divisors (see below), whose sum is σ = 149667750. Its totient is φ = 49889248.

The previous prime is 99778487. The next prime is 99778507. The reversal of 99778498 is 89487799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89487799 = 509 ⋅175811.

It can be written as a sum of positive squares in only one way, i.e., 63091249 + 36687249 = 7943^2 + 6057^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 24944623 + ... + 24944626.

Almost surely, 2^99778498 is an apocalyptic number.

99778498 is a deficient number, since it is larger than the sum of its proper divisors (49889252).

99778498 is a wasteful number, since it uses less digits than its factorization.

99778498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49889251.

The product of its digits is 9144576, while the sum is 61.

The square root of 99778498 is about 9988.9187603063. The cubic root of 99778498 is about 463.8159229452.

The spelling of 99778498 in words is "ninety-nine million, seven hundred seventy-eight thousand, four hundred ninety-eight".