99879877990 has 16 divisors (see below), whose sum is σ = 180293089248. Its totient is φ = 39838771456.

The previous prime is 99879877931. The next prime is 99879878009. The reversal of 99879877990 is 9977897899.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14143762 + ... + 14150821.

It is an arithmetic number, because the mean of its divisors is an integer number (11268318078).

Almost surely, 2^99879877990 is an apocalyptic number.

99879877990 is a deficient number, since it is larger than the sum of its proper divisors (80413211258).

99879877990 is a wasteful number, since it uses less digits than its factorization.

99879877990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28294943.

The product of its (nonzero) digits is 1296243648, while the sum is 82.

The spelling of 99879877990 in words is "ninety-nine billion, eight hundred seventy-nine million, eight hundred seventy-seven thousand, nine hundred ninety".