99187887 has 4 divisors (see below), whose sum is σ = 132250520. Its totient is φ = 66125256.

The previous prime is 99187873. The next prime is 99187903. The reversal of 99187887 is 78878199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78878199 = 3 ⋅26292733.

It is not a de Polignac number, because 99187887 - 2¹⁰ = 99186863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99187687) 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, 16531312 + ... + 16531317.

It is an arithmetic number, because the mean of its divisors is an integer number (33062630).

Almost surely, 2^99187887 is an apocalyptic number.

99187887 is a deficient number, since it is larger than the sum of its proper divisors (33062633).

99187887 is a wasteful number, since it uses less digits than its factorization.

99187887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33062632.

The product of its digits is 2032128, while the sum is 57.

The square root of 99187887 is about 9959.3115725938. The cubic root of 99187887 is about 462.8989683256.

The spelling of 99187887 in words is "ninety-nine million, one hundred eighty-seven thousand, eight hundred eighty-seven".