99987667 has 16 divisors (see below), whose sum is σ = 110013120. Its totient is φ = 90854400.

The previous prime is 99987619. The next prime is 99987683. The reversal of 99987667 is 76678999.

It is not a de Polignac number, because 99987667 - 2⁷ = 99987539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99987067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155667 + ... + 156307.

It is an arithmetic number, because the mean of its divisors is an integer number (6875820).

Almost surely, 2^99987667 is an apocalyptic number.

99987667 is a deficient number, since it is larger than the sum of its proper divisors (10025453).

99987667 is an equidigital number, since it uses as much as digits as its factorization.

99987667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 725 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 61.

The square root of 99987667 is about 9999.3833309860. The cubic root of 99987667 is about 464.1398010051.

The spelling of 99987667 in words is "ninety-nine million, nine hundred eighty-seven thousand, six hundred sixty-seven".