99815078 has 48 divisors (see below), whose sum is σ = 174666240. Its totient is φ = 42659760.

The previous prime is 99815069. The next prime is 99815081. The reversal of 99815078 is 87051899.

It is a happy number.

It is a super-2 number, since 2×99815078² = 19926099592292168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 439601 + ... + 439827.

It is an arithmetic number, because the mean of its divisors is an integer number (3638880).

Almost surely, 2^99815078 is an apocalyptic number.

99815078 is a deficient number, since it is larger than the sum of its proper divisors (74851162).

99815078 is a wasteful number, since it uses less digits than its factorization.

99815078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 99815078 is about 9990.7496215249. The cubic root of 99815078 is about 463.8725961893.

The spelling of 99815078 in words is "ninety-nine million, eight hundred fifteen thousand, seventy-eight".