99639895 has 16 divisors (see below), whose sum is σ = 126108000. Its totient is φ = 75368448.

The previous prime is 99639889. The next prime is 99639913. The reversal of 99639895 is 59893699.

It is a cyclic number.

It is not a de Polignac number, because 99639895 - 2²¹ = 97542743 is a prime.

It is a super-2 number, since 2×99639895² = 19856217351222050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87691 + ... + 88819.

It is an arithmetic number, because the mean of its divisors is an integer number (7881750).

Almost surely, 2^99639895 is an apocalyptic number.

99639895 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

99639895 is a deficient number, since it is larger than the sum of its proper divisors (26468105).

99639895 is a wasteful number, since it uses less digits than its factorization.

99639895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082.

The product of its digits is 4723920, while the sum is 58.

The square root of 99639895 is about 9981.9785112972. The cubic root of 99639895 is about 463.6010601257.

The spelling of 99639895 in words is "ninety-nine million, six hundred thirty-nine thousand, eight hundred ninety-five".