99887775 has 48 divisors (see below), whose sum is σ = 181300896. Its totient is φ = 48222720.

The previous prime is 99887771. The next prime is 99887779. The reversal of 99887775 is 57778899.

It is an interprime number because it is at equal distance from previous prime (99887771) and next prime (99887779).

It is not a de Polignac number, because 99887775 - 2² = 99887771 is a prime.

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 (99887771) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50709 + ... + 52641.

It is an arithmetic number, because the mean of its divisors is an integer number (3777102).

Almost surely, 2^99887775 is an apocalyptic number.

99887775 is a deficient number, since it is larger than the sum of its proper divisors (81413121).

99887775 is a wasteful number, since it uses less digits than its factorization.

99887775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012 (or 2007 counting only the distinct ones).

The product of its digits is 8890560, while the sum is 60.

The square root of 99887775 is about 9994.3871748097. The cubic root of 99887775 is about 463.9851842648.

The spelling of 99887775 in words is "ninety-nine million, eight hundred eighty-seven thousand, seven hundred seventy-five".