99681879 has 16 divisors (see below), whose sum is σ = 145160064. Its totient is φ = 60343200.

The previous prime is 99681871. The next prime is 99681929. The reversal of 99681879 is 97818699.

It is not a de Polignac number, because 99681879 - 2³ = 99681871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99681871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49537 + ... + 51509.

It is an arithmetic number, because the mean of its divisors is an integer number (9072504).

Almost surely, 2^99681879 is an apocalyptic number.

99681879 is a deficient number, since it is larger than the sum of its proper divisors (45478185).

99681879 is a wasteful number, since it uses less digits than its factorization.

99681879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518.

The product of its digits is 1959552, while the sum is 57.

The square root of 99681879 is about 9984.0812797172. The cubic root of 99681879 is about 463.6661648839. Note that the first 3 decimals are identical.

The spelling of 99681879 in words is "ninety-nine million, six hundred eighty-one thousand, eight hundred seventy-nine".