99729881 has 4 divisors (see below), whose sum is σ = 99755700. Its totient is φ = 99704064.

The previous prime is 99729823. The next prime is 99729887. The reversal of 99729881 is 18892799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51552400 + 48177481 = 7180^2 + 6941^2 .

It is a cyclic number.

It is not a de Polignac number, because 99729881 - 2¹⁰ = 99728857 is a prime.

It is a super-2 number, since 2×99729881² = 19892098328548322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99729887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5816 + ... + 15273.

It is an arithmetic number, because the mean of its divisors is an integer number (24938925).

Almost surely, 2^99729881 is an apocalyptic number.

It is an amenable number.

99729881 is a deficient number, since it is larger than the sum of its proper divisors (25819).

99729881 is a wasteful number, since it uses less digits than its factorization.

99729881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25818.

The product of its digits is 653184, while the sum is 53.

The square root of 99729881 is about 9986.4849171267. The cubic root of 99729881 is about 463.7405793840.

The spelling of 99729881 in words is "ninety-nine million, seven hundred twenty-nine thousand, eight hundred eighty-one".