99878287 has 4 divisors (see below), whose sum is σ = 100117080. Its totient is φ = 99639496.

The previous prime is 99878279. The next prime is 99878297. The reversal of 99878287 is 78287899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78287899 = 1223 ⋅64013.

It is a cyclic number.

It is not a de Polignac number, because 99878287 - 2³ = 99878279 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 (99878227) 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, 118768 + ... + 119605.

It is an arithmetic number, because the mean of its divisors is an integer number (25029270).

Almost surely, 2^99878287 is an apocalyptic number.

99878287 is a deficient number, since it is larger than the sum of its proper divisors (238793).

99878287 is a wasteful number, since it uses less digits than its factorization.

99878287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238792.

The product of its digits is 4064256, while the sum is 58.

The square root of 99878287 is about 9993.9124971154. The cubic root of 99878287 is about 463.9704930082.

The spelling of 99878287 in words is "ninety-nine million, eight hundred seventy-eight thousand, two hundred eighty-seven".