99999887 has 8 divisors (see below), whose sum is σ = 107800560. Its totient is φ = 92214720.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999887 is 78899999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99999887 - 2²⁰ = 98951311 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999827) 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, 11939 + ... + 18507.

It is an arithmetic number, because the mean of its divisors is an integer number (13475070).

Almost surely, 2^99999887 is an apocalyptic number.

99999887 is a deficient number, since it is larger than the sum of its proper divisors (7800673).

99999887 is a wasteful number, since it uses less digits than its factorization.

99999887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7753.

The product of its digits is 26453952, while the sum is 68.

The square root of 99999887 is about 9999.9943499984. The cubic root of 99999887 is about 464.1587085280.

The spelling of 99999887 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred eighty-seven".