99981606 has 16 divisors (see below), whose sum is σ = 200443248. Its totient is φ = 33247200.

The previous prime is 99981601. The next prime is 99981613. The reversal of 99981606 is 60618999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99981601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17265 + ... + 22316.

It is an arithmetic number, because the mean of its divisors is an integer number (12527703).

Almost surely, 2^99981606 is an apocalyptic number.

99981606 is an abundant number, since it is smaller than the sum of its proper divisors (100461642).

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

99981606 is a wasteful number, since it uses less digits than its factorization.

99981606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40007.

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

The square root of 99981606 is about 9999.0802577037. The cubic root of 99981606 is about 464.1304224878.

The spelling of 99981606 in words is "ninety-nine million, nine hundred eighty-one thousand, six hundred six".