99661408 has 72 divisors (see below), whose sum is σ = 246543696. Its totient is φ = 38818560.

The previous prime is 99661381. The next prime is 99661417. The reversal of 99661408 is 80416699.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 25266 + ... + 28942.

It is an arithmetic number, because the mean of its divisors is an integer number (3424218).

Almost surely, 2^99661408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99661408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123271848).

99661408 is an abundant number, since it is smaller than the sum of its proper divisors (146882288).

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

99661408 is a wasteful number, since it uses less digits than its factorization.

99661408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3716 (or 3697 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 99661408 is about 9983.0560451197. The cubic root of 99661408 is about 463.6344227057.

The spelling of 99661408 in words is "ninety-nine million, six hundred sixty-one thousand, four hundred eight".