99459990 has 96 divisors (see below), whose sum is σ = 301916160. Its totient is φ = 22243392.

The previous prime is 99459953. The next prime is 99459991. The reversal of 99459990 is 9995499.

It is a happy number.

It is a super-2 number, since 2×99459990² = 19784579221600200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99459991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27931 + ... + 31289.

It is an arithmetic number, because the mean of its divisors is an integer number (3144960).

Almost surely, 2^99459990 is an apocalyptic number.

99459990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99459990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150958080).

99459990 is an abundant number, since it is smaller than the sum of its proper divisors (202456170).

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

99459990 is a wasteful number, since it uses less digits than its factorization.

99459990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426 (or 3423 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 54.

The square root of 99459990 is about 9972.9629498961. The cubic root of 99459990 is about 463.3218734406.

The spelling of 99459990 in words is "ninety-nine million, four hundred fifty-nine thousand, nine hundred ninety".