99938778 has 8 divisors (see below), whose sum is σ = 199877568. Its totient is φ = 33312924.

The previous prime is 99938777. The next prime is 99938791. The reversal of 99938778 is 87783999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

99938778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (99938777) 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 3 ways as a sum of consecutive naturals, for example, 8328226 + ... + 8328237.

It is an arithmetic number, because the mean of its divisors is an integer number (24984696).

Almost surely, 2^99938778 is an apocalyptic number.

99938778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99938778 is a wasteful number, since it uses less digits than its factorization.

99938778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16656468.

The product of its digits is 6858432, while the sum is 60.

The square root of 99938778 is about 9996.9384313399. The cubic root of 99938778 is about 464.0641415739.

The spelling of 99938778 in words is "ninety-nine million, nine hundred thirty-eight thousand, seven hundred seventy-eight".