99859978 has 8 divisors (see below), whose sum is σ = 152328960. Its totient is φ = 49083660.

The previous prime is 99859961. The next prime is 99859979. The reversal of 99859978 is 87995899.

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

It is not an unprimeable number, because it can be changed into a prime (99859979) 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, 423018 + ... + 423253.

It is an arithmetic number, because the mean of its divisors is an integer number (19041120).

Almost surely, 2^99859978 is an apocalyptic number.

99859978 is a deficient number, since it is larger than the sum of its proper divisors (52468982).

99859978 is a wasteful number, since it uses less digits than its factorization.

99859978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846332.

The product of its digits is 14696640, while the sum is 64.

The square root of 99859978 is about 9992.9964475126. The cubic root of 99859978 is about 463.9421406501.

The spelling of 99859978 in words is "ninety-nine million, eight hundred fifty-nine thousand, nine hundred seventy-eight".