99981408 has 48 divisors (see below), whose sum is σ = 268047360. Its totient is φ = 32616576.

The previous prime is 99981389. The next prime is 99981421. The reversal of 99981408 is 80418999.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

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 7 ways as a sum of consecutive naturals, for example, 6568 + ... + 15591.

It is an arithmetic number, because the mean of its divisors is an integer number (5584320).

Almost surely, 2^99981408 is an apocalyptic number.

It is an amenable number.

99981408 is an abundant number, since it is smaller than the sum of its proper divisors (168065952).

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

99981408 is a wasteful number, since it uses less digits than its factorization.

99981408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22219 (or 22211 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 99981408 is about 9999.0703567882. The cubic root of 99981408 is about 464.1301161052.

The spelling of 99981408 in words is "ninety-nine million, nine hundred eighty-one thousand, four hundred eight".