99990087 has 4 divisors (see below), whose sum is σ = 133320120. Its totient is φ = 66660056.

The previous prime is 99990083. The next prime is 99990091. The reversal of 99990087 is 78009999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78009999 = 3 ⋅26003333.

It is an interprime number because it is at equal distance from previous prime (99990083) and next prime (99990091).

It is a cyclic number.

It is not a de Polignac number, because 99990087 - 2² = 99990083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99990083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16665012 + ... + 16665017.

It is an arithmetic number, because the mean of its divisors is an integer number (33330030).

Almost surely, 2^99990087 is an apocalyptic number.

99990087 is a deficient number, since it is larger than the sum of its proper divisors (33330033).

99990087 is a wasteful number, since it uses less digits than its factorization.

99990087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33330032.

The product of its (nonzero) digits is 367416, while the sum is 51.

The square root of 99990087 is about 9999.5043377159. The cubic root of 99990087 is about 464.1435454978.

The spelling of 99990087 in words is "ninety-nine million, nine hundred ninety thousand, eighty-seven".