99788478 has 16 divisors (see below), whose sum is σ = 206459280. Its totient is φ = 32115776.

The previous prime is 99788477. The next prime is 99788503. The reversal of 99788478 is 87488799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99788477) 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 7 ways as a sum of consecutive naturals, for example, 286575 + ... + 286922.

It is an arithmetic number, because the mean of its divisors is an integer number (12903705).

Almost surely, 2^99788478 is an apocalyptic number.

99788478 is an abundant number, since it is smaller than the sum of its proper divisors (106670802).

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

99788478 is a wasteful number, since it uses less digits than its factorization.

99788478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573531.

The product of its digits is 8128512, while the sum is 60.

The square root of 99788478 is about 9989.4183013827. The cubic root of 99788478 is about 463.8313862921.

The spelling of 99788478 in words is "ninety-nine million, seven hundred eighty-eight thousand, four hundred seventy-eight".