99812550 has 48 divisors (see below), whose sum is σ = 250698240. Its totient is φ = 26276640.

The previous prime is 99812539. The next prime is 99812551. The reversal of 99812550 is 5521899.

It is a junction number, because it is equal to n+sod(n) for n = 99812499 and 99812508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99812551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7639 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (5222880).

Almost surely, 2^99812550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99812550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125349120).

99812550 is an abundant number, since it is smaller than the sum of its proper divisors (150885690).

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

99812550 is a wasteful number, since it uses less digits than its factorization.

99812550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8517 (or 8512 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 99812550 is about 9990.6231036908. The cubic root of 99812550 is about 463.8686800147.

The spelling of 99812550 in words is "ninety-nine million, eight hundred twelve thousand, five hundred fifty".