99809490 has 64 divisors (see below), whose sum is σ = 263181312. Its totient is φ = 24024000.

The previous prime is 99809483. The next prime is 99809509. The reversal of 99809490 is 9490899.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48829 + ... + 50831.

It is an arithmetic number, because the mean of its divisors is an integer number (4112208).

Almost surely, 2^99809490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99809490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131590656).

99809490 is an abundant number, since it is smaller than the sum of its proper divisors (163371822).

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

99809490 is a wasteful number, since it uses less digits than its factorization.

99809490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 99809490 is about 9990.4699589158. The cubic root of 99809490 is about 463.8639396199.

The spelling of 99809490 in words is "ninety-nine million, eight hundred nine thousand, four hundred ninety".