99778894 has 16 divisors (see below), whose sum is σ = 154740096. Its totient is φ = 48204000.

The previous prime is 99778867. The next prime is 99778907. The reversal of 99778894 is 49887799.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76044 + ... + 77344.

It is an arithmetic number, because the mean of its divisors is an integer number (9671256).

Almost surely, 2^99778894 is an apocalyptic number.

99778894 is a deficient number, since it is larger than the sum of its proper divisors (54961202).

99778894 is a wasteful number, since it uses less digits than its factorization.

99778894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571.

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

The square root of 99778894 is about 9988.9385822519. The cubic root of 99778894 is about 463.8165365405.

The spelling of 99778894 in words is "ninety-nine million, seven hundred seventy-eight thousand, eight hundred ninety-four".