99807499890 has 256 divisors, whose sum is σ = 320702976000. Its totient is φ = 21577466880.

The previous prime is 99807499877. The next prime is 99807499927. The reversal of 99807499890 is 9899470899.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 26535610 + ... + 26539370.

It is an arithmetic number, because the mean of its divisors is an integer number (1252746000).

Almost surely, 2^99807499890 is an apocalyptic number.

99807499890 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99807499890 is the 157962-nd decagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99807499890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160351488000).

99807499890 is an abundant number, since it is smaller than the sum of its proper divisors (220895476110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99807499890 is a wasteful number, since it uses less digits than its factorization.

99807499890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4542 (or 4536 counting only the distinct ones).

The product of its (nonzero) digits is 105815808, while the sum is 72.

The spelling of 99807499890 in words is "ninety-nine billion, eight hundred seven million, four hundred ninety-nine thousand, eight hundred ninety".