99511020 has 72 divisors (see below), whose sum is σ = 344975904. Its totient is φ = 22745088.

The previous prime is 99511003. The next prime is 99511021. The reversal of 99511020 is 2011599.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (99511021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38229 + ... + 40748.

It is an arithmetic number, because the mean of its divisors is an integer number (4791332).

Almost surely, 2^99511020 is an apocalyptic number.

99511020 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99511020 is an abundant number, since it is smaller than the sum of its proper divisors (245464884).

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

99511020 is a wasteful number, since it uses less digits than its factorization.

99511020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78999 (or 78994 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 99511020 is about 9975.5210390235. The cubic root of 99511020 is about 463.4010988417.

The spelling of 99511020 in words is "ninety-nine million, five hundred eleven thousand, twenty".