99905878 has 8 divisors (see below), whose sum is σ = 150519672. Its totient is φ = 49732656.

The previous prime is 99905873. The next prime is 99905881. The reversal of 99905878 is 87850999.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99905873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109575 + ... + 110482.

It is an arithmetic number, because the mean of its divisors is an integer number (18814959).

Almost surely, 2^99905878 is an apocalyptic number.

99905878 is a deficient number, since it is larger than the sum of its proper divisors (50613794).

99905878 is a wasteful number, since it uses less digits than its factorization.

99905878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220286.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The square root of 99905878 is about 9995.2927921097. The cubic root of 99905878 is about 464.0132124409.

The spelling of 99905878 in words is "ninety-nine million, nine hundred five thousand, eight hundred seventy-eight".