99678967 has 4 divisors (see below), whose sum is σ = 100255320. Its totient is φ = 99102616.

The previous prime is 99678947. The next prime is 99678977. The reversal of 99678967 is 76987699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76987699 = 911 ⋅84509.

It is a cyclic number.

It is not a de Polignac number, because 99678967 - 2¹¹ = 99676919 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 (99678947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287917 + ... + 288262.

It is an arithmetic number, because the mean of its divisors is an integer number (25063830).

Almost surely, 2^99678967 is an apocalyptic number.

99678967 is a deficient number, since it is larger than the sum of its proper divisors (576353).

99678967 is a wasteful number, since it uses less digits than its factorization.

99678967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576352.

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

The square root of 99678967 is about 9983.9354465061. The cubic root of 99678967 is about 463.6616498238.

The spelling of 99678967 in words is "ninety-nine million, six hundred seventy-eight thousand, nine hundred sixty-seven".