99887777 has 4 divisors (see below), whose sum is σ = 108968496. Its totient is φ = 90807060.

The previous prime is 99887771. The next prime is 99887779. The reversal of 99887777 is 77778899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99887777 - 2⁶ = 99887713 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99887771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4540343 + ... + 4540364.

It is an arithmetic number, because the mean of its divisors is an integer number (27242124).

Almost surely, 2^99887777 is an apocalyptic number.

It is an amenable number.

99887777 is a deficient number, since it is larger than the sum of its proper divisors (9080719).

99887777 is a wasteful number, since it uses less digits than its factorization.

99887777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9080718.

The product of its digits is 12446784, while the sum is 62.

The square root of 99887777 is about 9994.3872748658. The cubic root of 99887777 is about 463.9851873616.

The spelling of 99887777 in words is "ninety-nine million, eight hundred eighty-seven thousand, seven hundred seventy-seven".